2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/list.h>
41 #include <linux/highmem.h>
42 #include <linux/spinlock.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/interrupt.h>
47 #include <linux/completion.h>
48 #include <linux/suspend.h>
49 #include <linux/workqueue.h>
50 #include <linux/jiffies.h>
51 #include <linux/scatterlist.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_host.h>
55 #include <linux/libata.h>
57 #include <asm/semaphore.h>
58 #include <asm/byteorder.h>
62 #define DRV_VERSION "2.21" /* must be exactly four chars */
65 /* debounce timing parameters in msecs { interval, duration, timeout } */
66 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
67 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
68 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
70 static unsigned int ata_dev_init_params(struct ata_device *dev,
71 u16 heads, u16 sectors);
72 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
73 static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable);
74 static void ata_dev_xfermask(struct ata_device *dev);
75 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
77 unsigned int ata_print_id = 1;
78 static struct workqueue_struct *ata_wq;
80 struct workqueue_struct *ata_aux_wq;
82 int atapi_enabled = 1;
83 module_param(atapi_enabled, int, 0444);
84 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
87 module_param(atapi_dmadir, int, 0444);
88 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
90 int atapi_passthru16 = 1;
91 module_param(atapi_passthru16, int, 0444);
92 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
95 module_param_named(fua, libata_fua, int, 0444);
96 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
98 static int ata_ignore_hpa = 0;
99 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
100 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
102 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
103 module_param(ata_probe_timeout, int, 0444);
104 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
106 int libata_noacpi = 1;
107 module_param_named(noacpi, libata_noacpi, int, 0444);
108 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");
110 MODULE_AUTHOR("Jeff Garzik");
111 MODULE_DESCRIPTION("Library module for ATA devices");
112 MODULE_LICENSE("GPL");
113 MODULE_VERSION(DRV_VERSION);
117 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
118 * @tf: Taskfile to convert
119 * @pmp: Port multiplier port
120 * @is_cmd: This FIS is for command
121 * @fis: Buffer into which data will output
123 * Converts a standard ATA taskfile to a Serial ATA
124 * FIS structure (Register - Host to Device).
127 * Inherited from caller.
129 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
131 fis[0] = 0x27; /* Register - Host to Device FIS */
132 fis[1] = pmp & 0xf; /* Port multiplier number*/
134 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
136 fis[2] = tf->command;
137 fis[3] = tf->feature;
144 fis[8] = tf->hob_lbal;
145 fis[9] = tf->hob_lbam;
146 fis[10] = tf->hob_lbah;
147 fis[11] = tf->hob_feature;
150 fis[13] = tf->hob_nsect;
161 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
162 * @fis: Buffer from which data will be input
163 * @tf: Taskfile to output
165 * Converts a serial ATA FIS structure to a standard ATA taskfile.
168 * Inherited from caller.
171 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
173 tf->command = fis[2]; /* status */
174 tf->feature = fis[3]; /* error */
181 tf->hob_lbal = fis[8];
182 tf->hob_lbam = fis[9];
183 tf->hob_lbah = fis[10];
186 tf->hob_nsect = fis[13];
189 static const u8 ata_rw_cmds[] = {
193 ATA_CMD_READ_MULTI_EXT,
194 ATA_CMD_WRITE_MULTI_EXT,
198 ATA_CMD_WRITE_MULTI_FUA_EXT,
202 ATA_CMD_PIO_READ_EXT,
203 ATA_CMD_PIO_WRITE_EXT,
216 ATA_CMD_WRITE_FUA_EXT
220 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
221 * @tf: command to examine and configure
222 * @dev: device tf belongs to
224 * Examine the device configuration and tf->flags to calculate
225 * the proper read/write commands and protocol to use.
230 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
234 int index, fua, lba48, write;
236 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
237 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
238 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
240 if (dev->flags & ATA_DFLAG_PIO) {
241 tf->protocol = ATA_PROT_PIO;
242 index = dev->multi_count ? 0 : 8;
243 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
244 /* Unable to use DMA due to host limitation */
245 tf->protocol = ATA_PROT_PIO;
246 index = dev->multi_count ? 0 : 8;
248 tf->protocol = ATA_PROT_DMA;
252 cmd = ata_rw_cmds[index + fua + lba48 + write];
261 * ata_tf_read_block - Read block address from ATA taskfile
262 * @tf: ATA taskfile of interest
263 * @dev: ATA device @tf belongs to
268 * Read block address from @tf. This function can handle all
269 * three address formats - LBA, LBA48 and CHS. tf->protocol and
270 * flags select the address format to use.
273 * Block address read from @tf.
275 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
279 if (tf->flags & ATA_TFLAG_LBA) {
280 if (tf->flags & ATA_TFLAG_LBA48) {
281 block |= (u64)tf->hob_lbah << 40;
282 block |= (u64)tf->hob_lbam << 32;
283 block |= tf->hob_lbal << 24;
285 block |= (tf->device & 0xf) << 24;
287 block |= tf->lbah << 16;
288 block |= tf->lbam << 8;
293 cyl = tf->lbam | (tf->lbah << 8);
294 head = tf->device & 0xf;
297 block = (cyl * dev->heads + head) * dev->sectors + sect;
304 * ata_build_rw_tf - Build ATA taskfile for given read/write request
305 * @tf: Target ATA taskfile
306 * @dev: ATA device @tf belongs to
307 * @block: Block address
308 * @n_block: Number of blocks
309 * @tf_flags: RW/FUA etc...
315 * Build ATA taskfile @tf for read/write request described by
316 * @block, @n_block, @tf_flags and @tag on @dev.
320 * 0 on success, -ERANGE if the request is too large for @dev,
321 * -EINVAL if the request is invalid.
323 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
324 u64 block, u32 n_block, unsigned int tf_flags,
327 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
328 tf->flags |= tf_flags;
330 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
332 if (!lba_48_ok(block, n_block))
335 tf->protocol = ATA_PROT_NCQ;
336 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
338 if (tf->flags & ATA_TFLAG_WRITE)
339 tf->command = ATA_CMD_FPDMA_WRITE;
341 tf->command = ATA_CMD_FPDMA_READ;
343 tf->nsect = tag << 3;
344 tf->hob_feature = (n_block >> 8) & 0xff;
345 tf->feature = n_block & 0xff;
347 tf->hob_lbah = (block >> 40) & 0xff;
348 tf->hob_lbam = (block >> 32) & 0xff;
349 tf->hob_lbal = (block >> 24) & 0xff;
350 tf->lbah = (block >> 16) & 0xff;
351 tf->lbam = (block >> 8) & 0xff;
352 tf->lbal = block & 0xff;
355 if (tf->flags & ATA_TFLAG_FUA)
356 tf->device |= 1 << 7;
357 } else if (dev->flags & ATA_DFLAG_LBA) {
358 tf->flags |= ATA_TFLAG_LBA;
360 if (lba_28_ok(block, n_block)) {
362 tf->device |= (block >> 24) & 0xf;
363 } else if (lba_48_ok(block, n_block)) {
364 if (!(dev->flags & ATA_DFLAG_LBA48))
368 tf->flags |= ATA_TFLAG_LBA48;
370 tf->hob_nsect = (n_block >> 8) & 0xff;
372 tf->hob_lbah = (block >> 40) & 0xff;
373 tf->hob_lbam = (block >> 32) & 0xff;
374 tf->hob_lbal = (block >> 24) & 0xff;
376 /* request too large even for LBA48 */
379 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
382 tf->nsect = n_block & 0xff;
384 tf->lbah = (block >> 16) & 0xff;
385 tf->lbam = (block >> 8) & 0xff;
386 tf->lbal = block & 0xff;
388 tf->device |= ATA_LBA;
391 u32 sect, head, cyl, track;
393 /* The request -may- be too large for CHS addressing. */
394 if (!lba_28_ok(block, n_block))
397 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
400 /* Convert LBA to CHS */
401 track = (u32)block / dev->sectors;
402 cyl = track / dev->heads;
403 head = track % dev->heads;
404 sect = (u32)block % dev->sectors + 1;
406 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
407 (u32)block, track, cyl, head, sect);
409 /* Check whether the converted CHS can fit.
413 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
416 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
427 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
428 * @pio_mask: pio_mask
429 * @mwdma_mask: mwdma_mask
430 * @udma_mask: udma_mask
432 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
433 * unsigned int xfer_mask.
441 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
442 unsigned int mwdma_mask,
443 unsigned int udma_mask)
445 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
446 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
447 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
451 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
452 * @xfer_mask: xfer_mask to unpack
453 * @pio_mask: resulting pio_mask
454 * @mwdma_mask: resulting mwdma_mask
455 * @udma_mask: resulting udma_mask
457 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
458 * Any NULL distination masks will be ignored.
460 static void ata_unpack_xfermask(unsigned int xfer_mask,
461 unsigned int *pio_mask,
462 unsigned int *mwdma_mask,
463 unsigned int *udma_mask)
466 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
468 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
470 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
473 static const struct ata_xfer_ent {
477 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
478 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
479 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
484 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
485 * @xfer_mask: xfer_mask of interest
487 * Return matching XFER_* value for @xfer_mask. Only the highest
488 * bit of @xfer_mask is considered.
494 * Matching XFER_* value, 0 if no match found.
496 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
498 int highbit = fls(xfer_mask) - 1;
499 const struct ata_xfer_ent *ent;
501 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
502 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
503 return ent->base + highbit - ent->shift;
508 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
509 * @xfer_mode: XFER_* of interest
511 * Return matching xfer_mask for @xfer_mode.
517 * Matching xfer_mask, 0 if no match found.
519 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
521 const struct ata_xfer_ent *ent;
523 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
524 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
525 return 1 << (ent->shift + xfer_mode - ent->base);
530 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
531 * @xfer_mode: XFER_* of interest
533 * Return matching xfer_shift for @xfer_mode.
539 * Matching xfer_shift, -1 if no match found.
541 static int ata_xfer_mode2shift(unsigned int xfer_mode)
543 const struct ata_xfer_ent *ent;
545 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
546 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
552 * ata_mode_string - convert xfer_mask to string
553 * @xfer_mask: mask of bits supported; only highest bit counts.
555 * Determine string which represents the highest speed
556 * (highest bit in @modemask).
562 * Constant C string representing highest speed listed in
563 * @mode_mask, or the constant C string "<n/a>".
565 static const char *ata_mode_string(unsigned int xfer_mask)
567 static const char * const xfer_mode_str[] = {
591 highbit = fls(xfer_mask) - 1;
592 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
593 return xfer_mode_str[highbit];
597 static const char *sata_spd_string(unsigned int spd)
599 static const char * const spd_str[] = {
604 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
606 return spd_str[spd - 1];
609 void ata_dev_disable(struct ata_device *dev)
611 if (ata_dev_enabled(dev)) {
612 if (ata_msg_drv(dev->link->ap))
613 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
614 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
621 * ata_devchk - PATA device presence detection
622 * @ap: ATA channel to examine
623 * @device: Device to examine (starting at zero)
625 * This technique was originally described in
626 * Hale Landis's ATADRVR (www.ata-atapi.com), and
627 * later found its way into the ATA/ATAPI spec.
629 * Write a pattern to the ATA shadow registers,
630 * and if a device is present, it will respond by
631 * correctly storing and echoing back the
632 * ATA shadow register contents.
638 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
640 struct ata_ioports *ioaddr = &ap->ioaddr;
643 ap->ops->dev_select(ap, device);
645 iowrite8(0x55, ioaddr->nsect_addr);
646 iowrite8(0xaa, ioaddr->lbal_addr);
648 iowrite8(0xaa, ioaddr->nsect_addr);
649 iowrite8(0x55, ioaddr->lbal_addr);
651 iowrite8(0x55, ioaddr->nsect_addr);
652 iowrite8(0xaa, ioaddr->lbal_addr);
654 nsect = ioread8(ioaddr->nsect_addr);
655 lbal = ioread8(ioaddr->lbal_addr);
657 if ((nsect == 0x55) && (lbal == 0xaa))
658 return 1; /* we found a device */
660 return 0; /* nothing found */
664 * ata_dev_classify - determine device type based on ATA-spec signature
665 * @tf: ATA taskfile register set for device to be identified
667 * Determine from taskfile register contents whether a device is
668 * ATA or ATAPI, as per "Signature and persistence" section
669 * of ATA/PI spec (volume 1, sect 5.14).
675 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
676 * the event of failure.
679 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
681 /* Apple's open source Darwin code hints that some devices only
682 * put a proper signature into the LBA mid/high registers,
683 * So, we only check those. It's sufficient for uniqueness.
686 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
687 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
688 DPRINTK("found ATA device by sig\n");
692 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
693 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
694 DPRINTK("found ATAPI device by sig\n");
695 return ATA_DEV_ATAPI;
698 DPRINTK("unknown device\n");
699 return ATA_DEV_UNKNOWN;
703 * ata_dev_try_classify - Parse returned ATA device signature
704 * @ap: ATA channel to examine
705 * @device: Device to examine (starting at zero)
706 * @r_err: Value of error register on completion
708 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
709 * an ATA/ATAPI-defined set of values is placed in the ATA
710 * shadow registers, indicating the results of device detection
713 * Select the ATA device, and read the values from the ATA shadow
714 * registers. Then parse according to the Error register value,
715 * and the spec-defined values examined by ata_dev_classify().
721 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
725 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
727 struct ata_taskfile tf;
731 ap->ops->dev_select(ap, device);
733 memset(&tf, 0, sizeof(tf));
735 ap->ops->tf_read(ap, &tf);
740 /* see if device passed diags: if master then continue and warn later */
741 if (err == 0 && device == 0)
742 /* diagnostic fail : do nothing _YET_ */
743 ap->link.device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
746 else if ((device == 0) && (err == 0x81))
751 /* determine if device is ATA or ATAPI */
752 class = ata_dev_classify(&tf);
754 if (class == ATA_DEV_UNKNOWN)
756 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
762 * ata_id_string - Convert IDENTIFY DEVICE page into string
763 * @id: IDENTIFY DEVICE results we will examine
764 * @s: string into which data is output
765 * @ofs: offset into identify device page
766 * @len: length of string to return. must be an even number.
768 * The strings in the IDENTIFY DEVICE page are broken up into
769 * 16-bit chunks. Run through the string, and output each
770 * 8-bit chunk linearly, regardless of platform.
776 void ata_id_string(const u16 *id, unsigned char *s,
777 unsigned int ofs, unsigned int len)
796 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
797 * @id: IDENTIFY DEVICE results we will examine
798 * @s: string into which data is output
799 * @ofs: offset into identify device page
800 * @len: length of string to return. must be an odd number.
802 * This function is identical to ata_id_string except that it
803 * trims trailing spaces and terminates the resulting string with
804 * null. @len must be actual maximum length (even number) + 1.
809 void ata_id_c_string(const u16 *id, unsigned char *s,
810 unsigned int ofs, unsigned int len)
816 ata_id_string(id, s, ofs, len - 1);
818 p = s + strnlen(s, len - 1);
819 while (p > s && p[-1] == ' ')
824 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
828 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
829 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
830 sectors |= (tf->hob_lbal & 0xff) << 24;
831 sectors |= (tf->lbah & 0xff) << 16;
832 sectors |= (tf->lbam & 0xff) << 8;
833 sectors |= (tf->lbal & 0xff);
838 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
842 sectors |= (tf->device & 0x0f) << 24;
843 sectors |= (tf->lbah & 0xff) << 16;
844 sectors |= (tf->lbam & 0xff) << 8;
845 sectors |= (tf->lbal & 0xff);
851 * ata_read_native_max_address_ext - LBA48 native max query
852 * @dev: Device to query
854 * Perform an LBA48 size query upon the device in question. Return the
855 * actual LBA48 size or zero if the command fails.
858 static u64 ata_read_native_max_address_ext(struct ata_device *dev)
861 struct ata_taskfile tf;
863 ata_tf_init(dev, &tf);
865 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
866 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
867 tf.protocol |= ATA_PROT_NODATA;
870 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
874 return ata_tf_to_lba48(&tf);
878 * ata_read_native_max_address - LBA28 native max query
879 * @dev: Device to query
881 * Performa an LBA28 size query upon the device in question. Return the
882 * actual LBA28 size or zero if the command fails.
885 static u64 ata_read_native_max_address(struct ata_device *dev)
888 struct ata_taskfile tf;
890 ata_tf_init(dev, &tf);
892 tf.command = ATA_CMD_READ_NATIVE_MAX;
893 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
894 tf.protocol |= ATA_PROT_NODATA;
897 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
901 return ata_tf_to_lba(&tf);
905 * ata_set_native_max_address_ext - LBA48 native max set
906 * @dev: Device to query
907 * @new_sectors: new max sectors value to set for the device
909 * Perform an LBA48 size set max upon the device in question. Return the
910 * actual LBA48 size or zero if the command fails.
913 static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
916 struct ata_taskfile tf;
920 ata_tf_init(dev, &tf);
922 tf.command = ATA_CMD_SET_MAX_EXT;
923 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
924 tf.protocol |= ATA_PROT_NODATA;
927 tf.lbal = (new_sectors >> 0) & 0xff;
928 tf.lbam = (new_sectors >> 8) & 0xff;
929 tf.lbah = (new_sectors >> 16) & 0xff;
931 tf.hob_lbal = (new_sectors >> 24) & 0xff;
932 tf.hob_lbam = (new_sectors >> 32) & 0xff;
933 tf.hob_lbah = (new_sectors >> 40) & 0xff;
935 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
939 return ata_tf_to_lba48(&tf);
943 * ata_set_native_max_address - LBA28 native max set
944 * @dev: Device to query
945 * @new_sectors: new max sectors value to set for the device
947 * Perform an LBA28 size set max upon the device in question. Return the
948 * actual LBA28 size or zero if the command fails.
951 static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
954 struct ata_taskfile tf;
958 ata_tf_init(dev, &tf);
960 tf.command = ATA_CMD_SET_MAX;
961 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
962 tf.protocol |= ATA_PROT_NODATA;
964 tf.lbal = (new_sectors >> 0) & 0xff;
965 tf.lbam = (new_sectors >> 8) & 0xff;
966 tf.lbah = (new_sectors >> 16) & 0xff;
967 tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;
969 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
973 return ata_tf_to_lba(&tf);
977 * ata_hpa_resize - Resize a device with an HPA set
978 * @dev: Device to resize
980 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
981 * it if required to the full size of the media. The caller must check
982 * the drive has the HPA feature set enabled.
985 static u64 ata_hpa_resize(struct ata_device *dev)
987 u64 sectors = dev->n_sectors;
990 if (ata_id_has_lba48(dev->id))
991 hpa_sectors = ata_read_native_max_address_ext(dev);
993 hpa_sectors = ata_read_native_max_address(dev);
995 if (hpa_sectors > sectors) {
996 ata_dev_printk(dev, KERN_INFO,
997 "Host Protected Area detected:\n"
998 "\tcurrent size: %lld sectors\n"
999 "\tnative size: %lld sectors\n",
1000 (long long)sectors, (long long)hpa_sectors);
1002 if (ata_ignore_hpa) {
1003 if (ata_id_has_lba48(dev->id))
1004 hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
1006 hpa_sectors = ata_set_native_max_address(dev,
1010 ata_dev_printk(dev, KERN_INFO, "native size "
1011 "increased to %lld sectors\n",
1012 (long long)hpa_sectors);
1016 } else if (hpa_sectors < sectors)
1017 ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
1018 "is smaller than sectors (%lld)\n", __FUNCTION__,
1019 (long long)hpa_sectors, (long long)sectors);
1024 static u64 ata_id_n_sectors(const u16 *id)
1026 if (ata_id_has_lba(id)) {
1027 if (ata_id_has_lba48(id))
1028 return ata_id_u64(id, 100);
1030 return ata_id_u32(id, 60);
1032 if (ata_id_current_chs_valid(id))
1033 return ata_id_u32(id, 57);
1035 return id[1] * id[3] * id[6];
1040 * ata_id_to_dma_mode - Identify DMA mode from id block
1041 * @dev: device to identify
1042 * @unknown: mode to assume if we cannot tell
1044 * Set up the timing values for the device based upon the identify
1045 * reported values for the DMA mode. This function is used by drivers
1046 * which rely upon firmware configured modes, but wish to report the
1047 * mode correctly when possible.
1049 * In addition we emit similarly formatted messages to the default
1050 * ata_dev_set_mode handler, in order to provide consistency of
1054 void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
1059 /* Pack the DMA modes */
1060 mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
1061 if (dev->id[53] & 0x04)
1062 mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
1064 /* Select the mode in use */
1065 mode = ata_xfer_mask2mode(mask);
1068 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1069 ata_mode_string(mask));
1071 /* SWDMA perhaps ? */
1073 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
1076 /* Configure the device reporting */
1077 dev->xfer_mode = mode;
1078 dev->xfer_shift = ata_xfer_mode2shift(mode);
1082 * ata_noop_dev_select - Select device 0/1 on ATA bus
1083 * @ap: ATA channel to manipulate
1084 * @device: ATA device (numbered from zero) to select
1086 * This function performs no actual function.
1088 * May be used as the dev_select() entry in ata_port_operations.
1093 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
1099 * ata_std_dev_select - Select device 0/1 on ATA bus
1100 * @ap: ATA channel to manipulate
1101 * @device: ATA device (numbered from zero) to select
1103 * Use the method defined in the ATA specification to
1104 * make either device 0, or device 1, active on the
1105 * ATA channel. Works with both PIO and MMIO.
1107 * May be used as the dev_select() entry in ata_port_operations.
1113 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
1118 tmp = ATA_DEVICE_OBS;
1120 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1122 iowrite8(tmp, ap->ioaddr.device_addr);
1123 ata_pause(ap); /* needed; also flushes, for mmio */
1127 * ata_dev_select - Select device 0/1 on ATA bus
1128 * @ap: ATA channel to manipulate
1129 * @device: ATA device (numbered from zero) to select
1130 * @wait: non-zero to wait for Status register BSY bit to clear
1131 * @can_sleep: non-zero if context allows sleeping
1133 * Use the method defined in the ATA specification to
1134 * make either device 0, or device 1, active on the
1137 * This is a high-level version of ata_std_dev_select(),
1138 * which additionally provides the services of inserting
1139 * the proper pauses and status polling, where needed.
1145 void ata_dev_select(struct ata_port *ap, unsigned int device,
1146 unsigned int wait, unsigned int can_sleep)
1148 if (ata_msg_probe(ap))
1149 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1150 "device %u, wait %u\n", device, wait);
1155 ap->ops->dev_select(ap, device);
1158 if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
1165 * ata_dump_id - IDENTIFY DEVICE info debugging output
1166 * @id: IDENTIFY DEVICE page to dump
1168 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1175 static inline void ata_dump_id(const u16 *id)
1177 DPRINTK("49==0x%04x "
1187 DPRINTK("80==0x%04x "
1197 DPRINTK("88==0x%04x "
1204 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1205 * @id: IDENTIFY data to compute xfer mask from
1207 * Compute the xfermask for this device. This is not as trivial
1208 * as it seems if we must consider early devices correctly.
1210 * FIXME: pre IDE drive timing (do we care ?).
1218 static unsigned int ata_id_xfermask(const u16 *id)
1220 unsigned int pio_mask, mwdma_mask, udma_mask;
1222 /* Usual case. Word 53 indicates word 64 is valid */
1223 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1224 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1228 /* If word 64 isn't valid then Word 51 high byte holds
1229 * the PIO timing number for the maximum. Turn it into
1232 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1233 if (mode < 5) /* Valid PIO range */
1234 pio_mask = (2 << mode) - 1;
1238 /* But wait.. there's more. Design your standards by
1239 * committee and you too can get a free iordy field to
1240 * process. However its the speeds not the modes that
1241 * are supported... Note drivers using the timing API
1242 * will get this right anyway
1246 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1248 if (ata_id_is_cfa(id)) {
1250 * Process compact flash extended modes
1252 int pio = id[163] & 0x7;
1253 int dma = (id[163] >> 3) & 7;
1256 pio_mask |= (1 << 5);
1258 pio_mask |= (1 << 6);
1260 mwdma_mask |= (1 << 3);
1262 mwdma_mask |= (1 << 4);
1266 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1267 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1269 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1273 * ata_port_queue_task - Queue port_task
1274 * @ap: The ata_port to queue port_task for
1275 * @fn: workqueue function to be scheduled
1276 * @data: data for @fn to use
1277 * @delay: delay time for workqueue function
1279 * Schedule @fn(@data) for execution after @delay jiffies using
1280 * port_task. There is one port_task per port and it's the
1281 * user(low level driver)'s responsibility to make sure that only
1282 * one task is active at any given time.
1284 * libata core layer takes care of synchronization between
1285 * port_task and EH. ata_port_queue_task() may be ignored for EH
1289 * Inherited from caller.
1291 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1292 unsigned long delay)
1294 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1295 ap->port_task_data = data;
1297 /* may fail if ata_port_flush_task() in progress */
1298 queue_delayed_work(ata_wq, &ap->port_task, delay);
1302 * ata_port_flush_task - Flush port_task
1303 * @ap: The ata_port to flush port_task for
1305 * After this function completes, port_task is guranteed not to
1306 * be running or scheduled.
1309 * Kernel thread context (may sleep)
1311 void ata_port_flush_task(struct ata_port *ap)
1315 cancel_rearming_delayed_work(&ap->port_task);
1317 if (ata_msg_ctl(ap))
1318 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1321 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1323 struct completion *waiting = qc->private_data;
1329 * ata_exec_internal_sg - execute libata internal command
1330 * @dev: Device to which the command is sent
1331 * @tf: Taskfile registers for the command and the result
1332 * @cdb: CDB for packet command
1333 * @dma_dir: Data tranfer direction of the command
1334 * @sg: sg list for the data buffer of the command
1335 * @n_elem: Number of sg entries
1337 * Executes libata internal command with timeout. @tf contains
1338 * command on entry and result on return. Timeout and error
1339 * conditions are reported via return value. No recovery action
1340 * is taken after a command times out. It's caller's duty to
1341 * clean up after timeout.
1344 * None. Should be called with kernel context, might sleep.
1347 * Zero on success, AC_ERR_* mask on failure
1349 unsigned ata_exec_internal_sg(struct ata_device *dev,
1350 struct ata_taskfile *tf, const u8 *cdb,
1351 int dma_dir, struct scatterlist *sg,
1352 unsigned int n_elem)
1354 struct ata_link *link = dev->link;
1355 struct ata_port *ap = link->ap;
1356 u8 command = tf->command;
1357 struct ata_queued_cmd *qc;
1358 unsigned int tag, preempted_tag;
1359 u32 preempted_sactive, preempted_qc_active;
1360 DECLARE_COMPLETION_ONSTACK(wait);
1361 unsigned long flags;
1362 unsigned int err_mask;
1365 spin_lock_irqsave(ap->lock, flags);
1367 /* no internal command while frozen */
1368 if (ap->pflags & ATA_PFLAG_FROZEN) {
1369 spin_unlock_irqrestore(ap->lock, flags);
1370 return AC_ERR_SYSTEM;
1373 /* initialize internal qc */
1375 /* XXX: Tag 0 is used for drivers with legacy EH as some
1376 * drivers choke if any other tag is given. This breaks
1377 * ata_tag_internal() test for those drivers. Don't use new
1378 * EH stuff without converting to it.
1380 if (ap->ops->error_handler)
1381 tag = ATA_TAG_INTERNAL;
1385 if (test_and_set_bit(tag, &ap->qc_allocated))
1387 qc = __ata_qc_from_tag(ap, tag);
1395 preempted_tag = link->active_tag;
1396 preempted_sactive = link->sactive;
1397 preempted_qc_active = ap->qc_active;
1398 link->active_tag = ATA_TAG_POISON;
1402 /* prepare & issue qc */
1405 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1406 qc->flags |= ATA_QCFLAG_RESULT_TF;
1407 qc->dma_dir = dma_dir;
1408 if (dma_dir != DMA_NONE) {
1409 unsigned int i, buflen = 0;
1411 for (i = 0; i < n_elem; i++)
1412 buflen += sg[i].length;
1414 ata_sg_init(qc, sg, n_elem);
1415 qc->nbytes = buflen;
1418 qc->private_data = &wait;
1419 qc->complete_fn = ata_qc_complete_internal;
1423 spin_unlock_irqrestore(ap->lock, flags);
1425 rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1427 ata_port_flush_task(ap);
1430 spin_lock_irqsave(ap->lock, flags);
1432 /* We're racing with irq here. If we lose, the
1433 * following test prevents us from completing the qc
1434 * twice. If we win, the port is frozen and will be
1435 * cleaned up by ->post_internal_cmd().
1437 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1438 qc->err_mask |= AC_ERR_TIMEOUT;
1440 if (ap->ops->error_handler)
1441 ata_port_freeze(ap);
1443 ata_qc_complete(qc);
1445 if (ata_msg_warn(ap))
1446 ata_dev_printk(dev, KERN_WARNING,
1447 "qc timeout (cmd 0x%x)\n", command);
1450 spin_unlock_irqrestore(ap->lock, flags);
1453 /* do post_internal_cmd */
1454 if (ap->ops->post_internal_cmd)
1455 ap->ops->post_internal_cmd(qc);
1457 /* perform minimal error analysis */
1458 if (qc->flags & ATA_QCFLAG_FAILED) {
1459 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1460 qc->err_mask |= AC_ERR_DEV;
1463 qc->err_mask |= AC_ERR_OTHER;
1465 if (qc->err_mask & ~AC_ERR_OTHER)
1466 qc->err_mask &= ~AC_ERR_OTHER;
1470 spin_lock_irqsave(ap->lock, flags);
1472 *tf = qc->result_tf;
1473 err_mask = qc->err_mask;
1476 link->active_tag = preempted_tag;
1477 link->sactive = preempted_sactive;
1478 ap->qc_active = preempted_qc_active;
1480 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1481 * Until those drivers are fixed, we detect the condition
1482 * here, fail the command with AC_ERR_SYSTEM and reenable the
1485 * Note that this doesn't change any behavior as internal
1486 * command failure results in disabling the device in the
1487 * higher layer for LLDDs without new reset/EH callbacks.
1489 * Kill the following code as soon as those drivers are fixed.
1491 if (ap->flags & ATA_FLAG_DISABLED) {
1492 err_mask |= AC_ERR_SYSTEM;
1496 spin_unlock_irqrestore(ap->lock, flags);
1502 * ata_exec_internal - execute libata internal command
1503 * @dev: Device to which the command is sent
1504 * @tf: Taskfile registers for the command and the result
1505 * @cdb: CDB for packet command
1506 * @dma_dir: Data tranfer direction of the command
1507 * @buf: Data buffer of the command
1508 * @buflen: Length of data buffer
1510 * Wrapper around ata_exec_internal_sg() which takes simple
1511 * buffer instead of sg list.
1514 * None. Should be called with kernel context, might sleep.
1517 * Zero on success, AC_ERR_* mask on failure
1519 unsigned ata_exec_internal(struct ata_device *dev,
1520 struct ata_taskfile *tf, const u8 *cdb,
1521 int dma_dir, void *buf, unsigned int buflen)
1523 struct scatterlist *psg = NULL, sg;
1524 unsigned int n_elem = 0;
1526 if (dma_dir != DMA_NONE) {
1528 sg_init_one(&sg, buf, buflen);
1533 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1537 * ata_do_simple_cmd - execute simple internal command
1538 * @dev: Device to which the command is sent
1539 * @cmd: Opcode to execute
1541 * Execute a 'simple' command, that only consists of the opcode
1542 * 'cmd' itself, without filling any other registers
1545 * Kernel thread context (may sleep).
1548 * Zero on success, AC_ERR_* mask on failure
1550 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1552 struct ata_taskfile tf;
1554 ata_tf_init(dev, &tf);
1557 tf.flags |= ATA_TFLAG_DEVICE;
1558 tf.protocol = ATA_PROT_NODATA;
1560 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1564 * ata_pio_need_iordy - check if iordy needed
1567 * Check if the current speed of the device requires IORDY. Used
1568 * by various controllers for chip configuration.
1571 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1573 /* Controller doesn't support IORDY. Probably a pointless check
1574 as the caller should know this */
1575 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1577 /* PIO3 and higher it is mandatory */
1578 if (adev->pio_mode > XFER_PIO_2)
1580 /* We turn it on when possible */
1581 if (ata_id_has_iordy(adev->id))
1587 * ata_pio_mask_no_iordy - Return the non IORDY mask
1590 * Compute the highest mode possible if we are not using iordy. Return
1591 * -1 if no iordy mode is available.
1594 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1596 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1597 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1598 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1599 /* Is the speed faster than the drive allows non IORDY ? */
1601 /* This is cycle times not frequency - watch the logic! */
1602 if (pio > 240) /* PIO2 is 240nS per cycle */
1603 return 3 << ATA_SHIFT_PIO;
1604 return 7 << ATA_SHIFT_PIO;
1607 return 3 << ATA_SHIFT_PIO;
1611 * ata_dev_read_id - Read ID data from the specified device
1612 * @dev: target device
1613 * @p_class: pointer to class of the target device (may be changed)
1614 * @flags: ATA_READID_* flags
1615 * @id: buffer to read IDENTIFY data into
1617 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1618 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1619 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1620 * for pre-ATA4 drives.
1622 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1623 * now we abort if we hit that case.
1626 * Kernel thread context (may sleep)
1629 * 0 on success, -errno otherwise.
1631 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1632 unsigned int flags, u16 *id)
1634 struct ata_port *ap = dev->link->ap;
1635 unsigned int class = *p_class;
1636 struct ata_taskfile tf;
1637 unsigned int err_mask = 0;
1639 int may_fallback = 1, tried_spinup = 0;
1642 if (ata_msg_ctl(ap))
1643 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1645 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1647 ata_tf_init(dev, &tf);
1651 tf.command = ATA_CMD_ID_ATA;
1654 tf.command = ATA_CMD_ID_ATAPI;
1658 reason = "unsupported class";
1662 tf.protocol = ATA_PROT_PIO;
1664 /* Some devices choke if TF registers contain garbage. Make
1665 * sure those are properly initialized.
1667 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1669 /* Device presence detection is unreliable on some
1670 * controllers. Always poll IDENTIFY if available.
1672 tf.flags |= ATA_TFLAG_POLLING;
1674 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1675 id, sizeof(id[0]) * ATA_ID_WORDS);
1677 if (err_mask & AC_ERR_NODEV_HINT) {
1678 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1679 ap->print_id, dev->devno);
1683 /* Device or controller might have reported the wrong
1684 * device class. Give a shot at the other IDENTIFY if
1685 * the current one is aborted by the device.
1688 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1691 if (class == ATA_DEV_ATA)
1692 class = ATA_DEV_ATAPI;
1694 class = ATA_DEV_ATA;
1699 reason = "I/O error";
1703 /* Falling back doesn't make sense if ID data was read
1704 * successfully at least once.
1708 swap_buf_le16(id, ATA_ID_WORDS);
1712 reason = "device reports invalid type";
1714 if (class == ATA_DEV_ATA) {
1715 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1718 if (ata_id_is_ata(id))
1722 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1725 * Drive powered-up in standby mode, and requires a specific
1726 * SET_FEATURES spin-up subcommand before it will accept
1727 * anything other than the original IDENTIFY command.
1729 ata_tf_init(dev, &tf);
1730 tf.command = ATA_CMD_SET_FEATURES;
1731 tf.feature = SETFEATURES_SPINUP;
1732 tf.protocol = ATA_PROT_NODATA;
1733 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1734 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1735 if (err_mask && id[2] != 0x738c) {
1737 reason = "SPINUP failed";
1741 * If the drive initially returned incomplete IDENTIFY info,
1742 * we now must reissue the IDENTIFY command.
1744 if (id[2] == 0x37c8)
1748 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1750 * The exact sequence expected by certain pre-ATA4 drives is:
1752 * IDENTIFY (optional in early ATA)
1753 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1755 * Some drives were very specific about that exact sequence.
1757 * Note that ATA4 says lba is mandatory so the second check
1758 * shoud never trigger.
1760 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1761 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1764 reason = "INIT_DEV_PARAMS failed";
1768 /* current CHS translation info (id[53-58]) might be
1769 * changed. reread the identify device info.
1771 flags &= ~ATA_READID_POSTRESET;
1781 if (ata_msg_warn(ap))
1782 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1783 "(%s, err_mask=0x%x)\n", reason, err_mask);
1787 static inline u8 ata_dev_knobble(struct ata_device *dev)
1789 struct ata_port *ap = dev->link->ap;
1790 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1793 static void ata_dev_config_ncq(struct ata_device *dev,
1794 char *desc, size_t desc_sz)
1796 struct ata_port *ap = dev->link->ap;
1797 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1799 if (!ata_id_has_ncq(dev->id)) {
1803 if (dev->horkage & ATA_HORKAGE_NONCQ) {
1804 snprintf(desc, desc_sz, "NCQ (not used)");
1807 if (ap->flags & ATA_FLAG_NCQ) {
1808 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1809 dev->flags |= ATA_DFLAG_NCQ;
1812 if (hdepth >= ddepth)
1813 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1815 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1819 * ata_dev_configure - Configure the specified ATA/ATAPI device
1820 * @dev: Target device to configure
1822 * Configure @dev according to @dev->id. Generic and low-level
1823 * driver specific fixups are also applied.
1826 * Kernel thread context (may sleep)
1829 * 0 on success, -errno otherwise
1831 int ata_dev_configure(struct ata_device *dev)
1833 struct ata_port *ap = dev->link->ap;
1834 struct ata_eh_context *ehc = &dev->link->eh_context;
1835 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1836 const u16 *id = dev->id;
1837 unsigned int xfer_mask;
1838 char revbuf[7]; /* XYZ-99\0 */
1839 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
1840 char modelbuf[ATA_ID_PROD_LEN+1];
1843 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
1844 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
1849 if (ata_msg_probe(ap))
1850 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1853 dev->horkage |= ata_dev_blacklisted(dev);
1855 /* let ACPI work its magic */
1856 rc = ata_acpi_on_devcfg(dev);
1860 /* print device capabilities */
1861 if (ata_msg_probe(ap))
1862 ata_dev_printk(dev, KERN_DEBUG,
1863 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1864 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1866 id[49], id[82], id[83], id[84],
1867 id[85], id[86], id[87], id[88]);
1869 /* initialize to-be-configured parameters */
1870 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1871 dev->max_sectors = 0;
1879 * common ATA, ATAPI feature tests
1882 /* find max transfer mode; for printk only */
1883 xfer_mask = ata_id_xfermask(id);
1885 if (ata_msg_probe(ap))
1888 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1889 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1892 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1895 /* ATA-specific feature tests */
1896 if (dev->class == ATA_DEV_ATA) {
1897 if (ata_id_is_cfa(id)) {
1898 if (id[162] & 1) /* CPRM may make this media unusable */
1899 ata_dev_printk(dev, KERN_WARNING,
1900 "supports DRM functions and may "
1901 "not be fully accessable.\n");
1902 snprintf(revbuf, 7, "CFA");
1905 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
1907 dev->n_sectors = ata_id_n_sectors(id);
1909 if (dev->id[59] & 0x100)
1910 dev->multi_count = dev->id[59] & 0xff;
1912 if (ata_id_has_lba(id)) {
1913 const char *lba_desc;
1917 dev->flags |= ATA_DFLAG_LBA;
1918 if (ata_id_has_lba48(id)) {
1919 dev->flags |= ATA_DFLAG_LBA48;
1922 if (dev->n_sectors >= (1UL << 28) &&
1923 ata_id_has_flush_ext(id))
1924 dev->flags |= ATA_DFLAG_FLUSH_EXT;
1927 if (!(dev->horkage & ATA_HORKAGE_BROKEN_HPA) &&
1928 ata_id_hpa_enabled(dev->id))
1929 dev->n_sectors = ata_hpa_resize(dev);
1932 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1934 /* print device info to dmesg */
1935 if (ata_msg_drv(ap) && print_info) {
1936 ata_dev_printk(dev, KERN_INFO,
1937 "%s: %s, %s, max %s\n",
1938 revbuf, modelbuf, fwrevbuf,
1939 ata_mode_string(xfer_mask));
1940 ata_dev_printk(dev, KERN_INFO,
1941 "%Lu sectors, multi %u: %s %s\n",
1942 (unsigned long long)dev->n_sectors,
1943 dev->multi_count, lba_desc, ncq_desc);
1948 /* Default translation */
1949 dev->cylinders = id[1];
1951 dev->sectors = id[6];
1953 if (ata_id_current_chs_valid(id)) {
1954 /* Current CHS translation is valid. */
1955 dev->cylinders = id[54];
1956 dev->heads = id[55];
1957 dev->sectors = id[56];
1960 /* print device info to dmesg */
1961 if (ata_msg_drv(ap) && print_info) {
1962 ata_dev_printk(dev, KERN_INFO,
1963 "%s: %s, %s, max %s\n",
1964 revbuf, modelbuf, fwrevbuf,
1965 ata_mode_string(xfer_mask));
1966 ata_dev_printk(dev, KERN_INFO,
1967 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
1968 (unsigned long long)dev->n_sectors,
1969 dev->multi_count, dev->cylinders,
1970 dev->heads, dev->sectors);
1977 /* ATAPI-specific feature tests */
1978 else if (dev->class == ATA_DEV_ATAPI) {
1979 char *cdb_intr_string = "";
1981 rc = atapi_cdb_len(id);
1982 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1983 if (ata_msg_warn(ap))
1984 ata_dev_printk(dev, KERN_WARNING,
1985 "unsupported CDB len\n");
1989 dev->cdb_len = (unsigned int) rc;
1992 * check to see if this ATAPI device supports
1993 * Asynchronous Notification
1995 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id)) {
1997 /* issue SET feature command to turn this on */
1998 err = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
2000 ata_dev_printk(dev, KERN_ERR,
2001 "unable to set AN, err %x\n",
2004 dev->flags |= ATA_DFLAG_AN;
2007 if (ata_id_cdb_intr(dev->id)) {
2008 dev->flags |= ATA_DFLAG_CDB_INTR;
2009 cdb_intr_string = ", CDB intr";
2012 /* print device info to dmesg */
2013 if (ata_msg_drv(ap) && print_info)
2014 ata_dev_printk(dev, KERN_INFO,
2015 "ATAPI: %s, %s, max %s%s\n",
2017 ata_mode_string(xfer_mask),
2021 /* determine max_sectors */
2022 dev->max_sectors = ATA_MAX_SECTORS;
2023 if (dev->flags & ATA_DFLAG_LBA48)
2024 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2026 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2027 /* Let the user know. We don't want to disallow opens for
2028 rescue purposes, or in case the vendor is just a blithering
2031 ata_dev_printk(dev, KERN_WARNING,
2032 "Drive reports diagnostics failure. This may indicate a drive\n");
2033 ata_dev_printk(dev, KERN_WARNING,
2034 "fault or invalid emulation. Contact drive vendor for information.\n");
2038 /* limit bridge transfers to udma5, 200 sectors */
2039 if (ata_dev_knobble(dev)) {
2040 if (ata_msg_drv(ap) && print_info)
2041 ata_dev_printk(dev, KERN_INFO,
2042 "applying bridge limits\n");
2043 dev->udma_mask &= ATA_UDMA5;
2044 dev->max_sectors = ATA_MAX_SECTORS;
2047 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2048 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2051 if (ap->ops->dev_config)
2052 ap->ops->dev_config(dev);
2054 if (ata_msg_probe(ap))
2055 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2056 __FUNCTION__, ata_chk_status(ap));
2060 if (ata_msg_probe(ap))
2061 ata_dev_printk(dev, KERN_DEBUG,
2062 "%s: EXIT, err\n", __FUNCTION__);
2067 * ata_cable_40wire - return 40 wire cable type
2070 * Helper method for drivers which want to hardwire 40 wire cable
2074 int ata_cable_40wire(struct ata_port *ap)
2076 return ATA_CBL_PATA40;
2080 * ata_cable_80wire - return 80 wire cable type
2083 * Helper method for drivers which want to hardwire 80 wire cable
2087 int ata_cable_80wire(struct ata_port *ap)
2089 return ATA_CBL_PATA80;
2093 * ata_cable_unknown - return unknown PATA cable.
2096 * Helper method for drivers which have no PATA cable detection.
2099 int ata_cable_unknown(struct ata_port *ap)
2101 return ATA_CBL_PATA_UNK;
2105 * ata_cable_sata - return SATA cable type
2108 * Helper method for drivers which have SATA cables
2111 int ata_cable_sata(struct ata_port *ap)
2113 return ATA_CBL_SATA;
2117 * ata_bus_probe - Reset and probe ATA bus
2120 * Master ATA bus probing function. Initiates a hardware-dependent
2121 * bus reset, then attempts to identify any devices found on
2125 * PCI/etc. bus probe sem.
2128 * Zero on success, negative errno otherwise.
2131 int ata_bus_probe(struct ata_port *ap)
2133 unsigned int classes[ATA_MAX_DEVICES];
2134 int tries[ATA_MAX_DEVICES];
2136 struct ata_device *dev;
2140 ata_link_for_each_dev(dev, &ap->link)
2141 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2144 /* reset and determine device classes */
2145 ap->ops->phy_reset(ap);
2147 ata_link_for_each_dev(dev, &ap->link) {
2148 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2149 dev->class != ATA_DEV_UNKNOWN)
2150 classes[dev->devno] = dev->class;
2152 classes[dev->devno] = ATA_DEV_NONE;
2154 dev->class = ATA_DEV_UNKNOWN;
2159 /* after the reset the device state is PIO 0 and the controller
2160 state is undefined. Record the mode */
2162 ata_link_for_each_dev(dev, &ap->link)
2163 dev->pio_mode = XFER_PIO_0;
2165 /* read IDENTIFY page and configure devices. We have to do the identify
2166 specific sequence bass-ackwards so that PDIAG- is released by
2169 ata_link_for_each_dev(dev, &ap->link) {
2170 if (tries[dev->devno])
2171 dev->class = classes[dev->devno];
2173 if (!ata_dev_enabled(dev))
2176 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2182 /* Now ask for the cable type as PDIAG- should have been released */
2183 if (ap->ops->cable_detect)
2184 ap->cbl = ap->ops->cable_detect(ap);
2186 /* After the identify sequence we can now set up the devices. We do
2187 this in the normal order so that the user doesn't get confused */
2189 ata_link_for_each_dev(dev, &ap->link) {
2190 if (!ata_dev_enabled(dev))
2193 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2194 rc = ata_dev_configure(dev);
2195 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2200 /* configure transfer mode */
2201 rc = ata_set_mode(&ap->link, &dev);
2205 ata_link_for_each_dev(dev, &ap->link)
2206 if (ata_dev_enabled(dev))
2209 /* no device present, disable port */
2210 ata_port_disable(ap);
2211 ap->ops->port_disable(ap);
2215 tries[dev->devno]--;
2219 /* eeek, something went very wrong, give up */
2220 tries[dev->devno] = 0;
2224 /* give it just one more chance */
2225 tries[dev->devno] = min(tries[dev->devno], 1);
2227 if (tries[dev->devno] == 1) {
2228 /* This is the last chance, better to slow
2229 * down than lose it.
2231 sata_down_spd_limit(&ap->link);
2232 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2236 if (!tries[dev->devno])
2237 ata_dev_disable(dev);
2243 * ata_port_probe - Mark port as enabled
2244 * @ap: Port for which we indicate enablement
2246 * Modify @ap data structure such that the system
2247 * thinks that the entire port is enabled.
2249 * LOCKING: host lock, or some other form of
2253 void ata_port_probe(struct ata_port *ap)
2255 ap->flags &= ~ATA_FLAG_DISABLED;
2259 * sata_print_link_status - Print SATA link status
2260 * @link: SATA link to printk link status about
2262 * This function prints link speed and status of a SATA link.
2267 void sata_print_link_status(struct ata_link *link)
2269 u32 sstatus, scontrol, tmp;
2271 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2273 sata_scr_read(link, SCR_CONTROL, &scontrol);
2275 if (ata_link_online(link)) {
2276 tmp = (sstatus >> 4) & 0xf;
2277 ata_link_printk(link, KERN_INFO,
2278 "SATA link up %s (SStatus %X SControl %X)\n",
2279 sata_spd_string(tmp), sstatus, scontrol);
2281 ata_link_printk(link, KERN_INFO,
2282 "SATA link down (SStatus %X SControl %X)\n",
2288 * __sata_phy_reset - Wake/reset a low-level SATA PHY
2289 * @ap: SATA port associated with target SATA PHY.
2291 * This function issues commands to standard SATA Sxxx
2292 * PHY registers, to wake up the phy (and device), and
2293 * clear any reset condition.
2296 * PCI/etc. bus probe sem.
2299 void __sata_phy_reset(struct ata_port *ap)
2301 struct ata_link *link = &ap->link;
2302 unsigned long timeout = jiffies + (HZ * 5);
2305 if (ap->flags & ATA_FLAG_SATA_RESET) {
2306 /* issue phy wake/reset */
2307 sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2308 /* Couldn't find anything in SATA I/II specs, but
2309 * AHCI-1.1 10.4.2 says at least 1 ms. */
2312 /* phy wake/clear reset */
2313 sata_scr_write_flush(link, SCR_CONTROL, 0x300);
2315 /* wait for phy to become ready, if necessary */
2318 sata_scr_read(link, SCR_STATUS, &sstatus);
2319 if ((sstatus & 0xf) != 1)
2321 } while (time_before(jiffies, timeout));
2323 /* print link status */
2324 sata_print_link_status(link);
2326 /* TODO: phy layer with polling, timeouts, etc. */
2327 if (!ata_link_offline(link))
2330 ata_port_disable(ap);
2332 if (ap->flags & ATA_FLAG_DISABLED)
2335 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2336 ata_port_disable(ap);
2340 ap->cbl = ATA_CBL_SATA;
2344 * sata_phy_reset - Reset SATA bus.
2345 * @ap: SATA port associated with target SATA PHY.
2347 * This function resets the SATA bus, and then probes
2348 * the bus for devices.
2351 * PCI/etc. bus probe sem.
2354 void sata_phy_reset(struct ata_port *ap)
2356 __sata_phy_reset(ap);
2357 if (ap->flags & ATA_FLAG_DISABLED)
2363 * ata_dev_pair - return other device on cable
2366 * Obtain the other device on the same cable, or if none is
2367 * present NULL is returned
2370 struct ata_device *ata_dev_pair(struct ata_device *adev)
2372 struct ata_link *link = adev->link;
2373 struct ata_device *pair = &link->device[1 - adev->devno];
2374 if (!ata_dev_enabled(pair))
2380 * ata_port_disable - Disable port.
2381 * @ap: Port to be disabled.
2383 * Modify @ap data structure such that the system
2384 * thinks that the entire port is disabled, and should
2385 * never attempt to probe or communicate with devices
2388 * LOCKING: host lock, or some other form of
2392 void ata_port_disable(struct ata_port *ap)
2394 ap->link.device[0].class = ATA_DEV_NONE;
2395 ap->link.device[1].class = ATA_DEV_NONE;
2396 ap->flags |= ATA_FLAG_DISABLED;
2400 * sata_down_spd_limit - adjust SATA spd limit downward
2401 * @link: Link to adjust SATA spd limit for
2403 * Adjust SATA spd limit of @link downward. Note that this
2404 * function only adjusts the limit. The change must be applied
2405 * using sata_set_spd().
2408 * Inherited from caller.
2411 * 0 on success, negative errno on failure
2413 int sata_down_spd_limit(struct ata_link *link)
2415 u32 sstatus, spd, mask;
2418 if (!sata_scr_valid(link))
2421 /* If SCR can be read, use it to determine the current SPD.
2422 * If not, use cached value in link->sata_spd.
2424 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2426 spd = (sstatus >> 4) & 0xf;
2428 spd = link->sata_spd;
2430 mask = link->sata_spd_limit;
2434 /* unconditionally mask off the highest bit */
2435 highbit = fls(mask) - 1;
2436 mask &= ~(1 << highbit);
2438 /* Mask off all speeds higher than or equal to the current
2439 * one. Force 1.5Gbps if current SPD is not available.
2442 mask &= (1 << (spd - 1)) - 1;
2446 /* were we already at the bottom? */
2450 link->sata_spd_limit = mask;
2452 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2453 sata_spd_string(fls(mask)));
2458 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2462 if (link->sata_spd_limit == UINT_MAX)
2465 limit = fls(link->sata_spd_limit);
2467 spd = (*scontrol >> 4) & 0xf;
2468 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
2470 return spd != limit;
2474 * sata_set_spd_needed - is SATA spd configuration needed
2475 * @link: Link in question
2477 * Test whether the spd limit in SControl matches
2478 * @link->sata_spd_limit. This function is used to determine
2479 * whether hardreset is necessary to apply SATA spd
2483 * Inherited from caller.
2486 * 1 if SATA spd configuration is needed, 0 otherwise.
2488 int sata_set_spd_needed(struct ata_link *link)
2492 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2495 return __sata_set_spd_needed(link, &scontrol);
2499 * sata_set_spd - set SATA spd according to spd limit
2500 * @link: Link to set SATA spd for
2502 * Set SATA spd of @link according to sata_spd_limit.
2505 * Inherited from caller.
2508 * 0 if spd doesn't need to be changed, 1 if spd has been
2509 * changed. Negative errno if SCR registers are inaccessible.
2511 int sata_set_spd(struct ata_link *link)
2516 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2519 if (!__sata_set_spd_needed(link, &scontrol))
2522 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2529 * This mode timing computation functionality is ported over from
2530 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2533 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2534 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2535 * for UDMA6, which is currently supported only by Maxtor drives.
2537 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2540 static const struct ata_timing ata_timing[] = {
2542 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2543 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2544 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2545 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2547 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2548 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2549 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2550 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2551 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2553 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2555 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2556 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2557 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2559 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2560 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2561 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2563 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2564 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2565 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2566 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2568 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2569 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2570 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2572 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2577 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2578 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2580 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2582 q->setup = EZ(t->setup * 1000, T);
2583 q->act8b = EZ(t->act8b * 1000, T);
2584 q->rec8b = EZ(t->rec8b * 1000, T);
2585 q->cyc8b = EZ(t->cyc8b * 1000, T);
2586 q->active = EZ(t->active * 1000, T);
2587 q->recover = EZ(t->recover * 1000, T);
2588 q->cycle = EZ(t->cycle * 1000, T);
2589 q->udma = EZ(t->udma * 1000, UT);
2592 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2593 struct ata_timing *m, unsigned int what)
2595 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2596 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2597 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2598 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2599 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2600 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2601 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2602 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2605 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
2607 const struct ata_timing *t;
2609 for (t = ata_timing; t->mode != speed; t++)
2610 if (t->mode == 0xFF)
2615 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2616 struct ata_timing *t, int T, int UT)
2618 const struct ata_timing *s;
2619 struct ata_timing p;
2625 if (!(s = ata_timing_find_mode(speed)))
2628 memcpy(t, s, sizeof(*s));
2631 * If the drive is an EIDE drive, it can tell us it needs extended
2632 * PIO/MW_DMA cycle timing.
2635 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2636 memset(&p, 0, sizeof(p));
2637 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2638 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2639 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2640 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2641 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2643 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2647 * Convert the timing to bus clock counts.
2650 ata_timing_quantize(t, t, T, UT);
2653 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2654 * S.M.A.R.T * and some other commands. We have to ensure that the
2655 * DMA cycle timing is slower/equal than the fastest PIO timing.
2658 if (speed > XFER_PIO_6) {
2659 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2660 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2664 * Lengthen active & recovery time so that cycle time is correct.
2667 if (t->act8b + t->rec8b < t->cyc8b) {
2668 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2669 t->rec8b = t->cyc8b - t->act8b;
2672 if (t->active + t->recover < t->cycle) {
2673 t->active += (t->cycle - (t->active + t->recover)) / 2;
2674 t->recover = t->cycle - t->active;
2677 /* In a few cases quantisation may produce enough errors to
2678 leave t->cycle too low for the sum of active and recovery
2679 if so we must correct this */
2680 if (t->active + t->recover > t->cycle)
2681 t->cycle = t->active + t->recover;
2687 * ata_down_xfermask_limit - adjust dev xfer masks downward
2688 * @dev: Device to adjust xfer masks
2689 * @sel: ATA_DNXFER_* selector
2691 * Adjust xfer masks of @dev downward. Note that this function
2692 * does not apply the change. Invoking ata_set_mode() afterwards
2693 * will apply the limit.
2696 * Inherited from caller.
2699 * 0 on success, negative errno on failure
2701 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2704 unsigned int orig_mask, xfer_mask;
2705 unsigned int pio_mask, mwdma_mask, udma_mask;
2708 quiet = !!(sel & ATA_DNXFER_QUIET);
2709 sel &= ~ATA_DNXFER_QUIET;
2711 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2714 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2717 case ATA_DNXFER_PIO:
2718 highbit = fls(pio_mask) - 1;
2719 pio_mask &= ~(1 << highbit);
2722 case ATA_DNXFER_DMA:
2724 highbit = fls(udma_mask) - 1;
2725 udma_mask &= ~(1 << highbit);
2728 } else if (mwdma_mask) {
2729 highbit = fls(mwdma_mask) - 1;
2730 mwdma_mask &= ~(1 << highbit);
2736 case ATA_DNXFER_40C:
2737 udma_mask &= ATA_UDMA_MASK_40C;
2740 case ATA_DNXFER_FORCE_PIO0:
2742 case ATA_DNXFER_FORCE_PIO:
2751 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
2753 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
2757 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
2758 snprintf(buf, sizeof(buf), "%s:%s",
2759 ata_mode_string(xfer_mask),
2760 ata_mode_string(xfer_mask & ATA_MASK_PIO));
2762 snprintf(buf, sizeof(buf), "%s",
2763 ata_mode_string(xfer_mask));
2765 ata_dev_printk(dev, KERN_WARNING,
2766 "limiting speed to %s\n", buf);
2769 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2775 static int ata_dev_set_mode(struct ata_device *dev)
2777 struct ata_eh_context *ehc = &dev->link->eh_context;
2778 unsigned int err_mask;
2781 dev->flags &= ~ATA_DFLAG_PIO;
2782 if (dev->xfer_shift == ATA_SHIFT_PIO)
2783 dev->flags |= ATA_DFLAG_PIO;
2785 err_mask = ata_dev_set_xfermode(dev);
2786 /* Old CFA may refuse this command, which is just fine */
2787 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
2788 err_mask &= ~AC_ERR_DEV;
2789 /* Some very old devices and some bad newer ones fail any kind of
2790 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
2791 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
2792 dev->pio_mode <= XFER_PIO_2)
2793 err_mask &= ~AC_ERR_DEV;
2795 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2796 "(err_mask=0x%x)\n", err_mask);
2800 ehc->i.flags |= ATA_EHI_POST_SETMODE;
2801 rc = ata_dev_revalidate(dev, 0);
2802 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2806 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2807 dev->xfer_shift, (int)dev->xfer_mode);
2809 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2810 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2815 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2816 * @link: link on which timings will be programmed
2817 * @r_failed_dev: out paramter for failed device
2819 * Standard implementation of the function used to tune and set
2820 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2821 * ata_dev_set_mode() fails, pointer to the failing device is
2822 * returned in @r_failed_dev.
2825 * PCI/etc. bus probe sem.
2828 * 0 on success, negative errno otherwise
2831 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
2833 struct ata_port *ap = link->ap;
2834 struct ata_device *dev;
2835 int rc = 0, used_dma = 0, found = 0;
2837 /* step 1: calculate xfer_mask */
2838 ata_link_for_each_dev(dev, link) {
2839 unsigned int pio_mask, dma_mask;
2841 if (!ata_dev_enabled(dev))
2844 ata_dev_xfermask(dev);
2846 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2847 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2848 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2849 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2858 /* step 2: always set host PIO timings */
2859 ata_link_for_each_dev(dev, link) {
2860 if (!ata_dev_enabled(dev))
2863 if (!dev->pio_mode) {
2864 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2869 dev->xfer_mode = dev->pio_mode;
2870 dev->xfer_shift = ATA_SHIFT_PIO;
2871 if (ap->ops->set_piomode)
2872 ap->ops->set_piomode(ap, dev);
2875 /* step 3: set host DMA timings */
2876 ata_link_for_each_dev(dev, link) {
2877 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2880 dev->xfer_mode = dev->dma_mode;
2881 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2882 if (ap->ops->set_dmamode)
2883 ap->ops->set_dmamode(ap, dev);
2886 /* step 4: update devices' xfer mode */
2887 ata_link_for_each_dev(dev, link) {
2888 /* don't update suspended devices' xfer mode */
2889 if (!ata_dev_enabled(dev))
2892 rc = ata_dev_set_mode(dev);
2897 /* Record simplex status. If we selected DMA then the other
2898 * host channels are not permitted to do so.
2900 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
2901 ap->host->simplex_claimed = ap;
2905 *r_failed_dev = dev;
2910 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2911 * @link: link on which timings will be programmed
2912 * @r_failed_dev: out paramter for failed device
2914 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2915 * ata_set_mode() fails, pointer to the failing device is
2916 * returned in @r_failed_dev.
2919 * PCI/etc. bus probe sem.
2922 * 0 on success, negative errno otherwise
2924 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
2926 struct ata_port *ap = link->ap;
2928 /* has private set_mode? */
2929 if (ap->ops->set_mode)
2930 return ap->ops->set_mode(link, r_failed_dev);
2931 return ata_do_set_mode(link, r_failed_dev);
2935 * ata_tf_to_host - issue ATA taskfile to host controller
2936 * @ap: port to which command is being issued
2937 * @tf: ATA taskfile register set
2939 * Issues ATA taskfile register set to ATA host controller,
2940 * with proper synchronization with interrupt handler and
2944 * spin_lock_irqsave(host lock)
2947 static inline void ata_tf_to_host(struct ata_port *ap,
2948 const struct ata_taskfile *tf)
2950 ap->ops->tf_load(ap, tf);
2951 ap->ops->exec_command(ap, tf);
2955 * ata_busy_sleep - sleep until BSY clears, or timeout
2956 * @ap: port containing status register to be polled
2957 * @tmout_pat: impatience timeout
2958 * @tmout: overall timeout
2960 * Sleep until ATA Status register bit BSY clears,
2961 * or a timeout occurs.
2964 * Kernel thread context (may sleep).
2967 * 0 on success, -errno otherwise.
2969 int ata_busy_sleep(struct ata_port *ap,
2970 unsigned long tmout_pat, unsigned long tmout)
2972 unsigned long timer_start, timeout;
2975 status = ata_busy_wait(ap, ATA_BUSY, 300);
2976 timer_start = jiffies;
2977 timeout = timer_start + tmout_pat;
2978 while (status != 0xff && (status & ATA_BUSY) &&
2979 time_before(jiffies, timeout)) {
2981 status = ata_busy_wait(ap, ATA_BUSY, 3);
2984 if (status != 0xff && (status & ATA_BUSY))
2985 ata_port_printk(ap, KERN_WARNING,
2986 "port is slow to respond, please be patient "
2987 "(Status 0x%x)\n", status);
2989 timeout = timer_start + tmout;
2990 while (status != 0xff && (status & ATA_BUSY) &&
2991 time_before(jiffies, timeout)) {
2993 status = ata_chk_status(ap);
2999 if (status & ATA_BUSY) {
3000 ata_port_printk(ap, KERN_ERR, "port failed to respond "
3001 "(%lu secs, Status 0x%x)\n",
3002 tmout / HZ, status);
3010 * ata_wait_ready - sleep until BSY clears, or timeout
3011 * @ap: port containing status register to be polled
3012 * @deadline: deadline jiffies for the operation
3014 * Sleep until ATA Status register bit BSY clears, or timeout
3018 * Kernel thread context (may sleep).
3021 * 0 on success, -errno otherwise.
3023 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
3025 unsigned long start = jiffies;
3029 u8 status = ata_chk_status(ap);
3030 unsigned long now = jiffies;
3032 if (!(status & ATA_BUSY))
3034 if (!ata_link_online(&ap->link) && status == 0xff)
3036 if (time_after(now, deadline))
3039 if (!warned && time_after(now, start + 5 * HZ) &&
3040 (deadline - now > 3 * HZ)) {
3041 ata_port_printk(ap, KERN_WARNING,
3042 "port is slow to respond, please be patient "
3043 "(Status 0x%x)\n", status);
3051 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3052 unsigned long deadline)
3054 struct ata_ioports *ioaddr = &ap->ioaddr;
3055 unsigned int dev0 = devmask & (1 << 0);
3056 unsigned int dev1 = devmask & (1 << 1);
3059 /* if device 0 was found in ata_devchk, wait for its
3063 rc = ata_wait_ready(ap, deadline);
3071 /* if device 1 was found in ata_devchk, wait for register
3072 * access briefly, then wait for BSY to clear.
3077 ap->ops->dev_select(ap, 1);
3079 /* Wait for register access. Some ATAPI devices fail
3080 * to set nsect/lbal after reset, so don't waste too
3081 * much time on it. We're gonna wait for !BSY anyway.
3083 for (i = 0; i < 2; i++) {
3086 nsect = ioread8(ioaddr->nsect_addr);
3087 lbal = ioread8(ioaddr->lbal_addr);
3088 if ((nsect == 1) && (lbal == 1))
3090 msleep(50); /* give drive a breather */
3093 rc = ata_wait_ready(ap, deadline);
3101 /* is all this really necessary? */
3102 ap->ops->dev_select(ap, 0);
3104 ap->ops->dev_select(ap, 1);
3106 ap->ops->dev_select(ap, 0);
3111 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3112 unsigned long deadline)
3114 struct ata_ioports *ioaddr = &ap->ioaddr;
3116 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3118 /* software reset. causes dev0 to be selected */
3119 iowrite8(ap->ctl, ioaddr->ctl_addr);
3120 udelay(20); /* FIXME: flush */
3121 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3122 udelay(20); /* FIXME: flush */
3123 iowrite8(ap->ctl, ioaddr->ctl_addr);
3125 /* spec mandates ">= 2ms" before checking status.
3126 * We wait 150ms, because that was the magic delay used for
3127 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
3128 * between when the ATA command register is written, and then
3129 * status is checked. Because waiting for "a while" before
3130 * checking status is fine, post SRST, we perform this magic
3131 * delay here as well.
3133 * Old drivers/ide uses the 2mS rule and then waits for ready
3137 /* Before we perform post reset processing we want to see if
3138 * the bus shows 0xFF because the odd clown forgets the D7
3139 * pulldown resistor.
3141 if (ata_check_status(ap) == 0xFF)
3144 return ata_bus_post_reset(ap, devmask, deadline);
3148 * ata_bus_reset - reset host port and associated ATA channel
3149 * @ap: port to reset
3151 * This is typically the first time we actually start issuing
3152 * commands to the ATA channel. We wait for BSY to clear, then
3153 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3154 * result. Determine what devices, if any, are on the channel
3155 * by looking at the device 0/1 error register. Look at the signature
3156 * stored in each device's taskfile registers, to determine if
3157 * the device is ATA or ATAPI.
3160 * PCI/etc. bus probe sem.
3161 * Obtains host lock.
3164 * Sets ATA_FLAG_DISABLED if bus reset fails.
3167 void ata_bus_reset(struct ata_port *ap)
3169 struct ata_device *device = ap->link.device;
3170 struct ata_ioports *ioaddr = &ap->ioaddr;
3171 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3173 unsigned int dev0, dev1 = 0, devmask = 0;
3176 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3178 /* determine if device 0/1 are present */
3179 if (ap->flags & ATA_FLAG_SATA_RESET)
3182 dev0 = ata_devchk(ap, 0);
3184 dev1 = ata_devchk(ap, 1);
3188 devmask |= (1 << 0);
3190 devmask |= (1 << 1);
3192 /* select device 0 again */
3193 ap->ops->dev_select(ap, 0);
3195 /* issue bus reset */
3196 if (ap->flags & ATA_FLAG_SRST) {
3197 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3198 if (rc && rc != -ENODEV)
3203 * determine by signature whether we have ATA or ATAPI devices
3205 device[0].class = ata_dev_try_classify(ap, 0, &err);
3206 if ((slave_possible) && (err != 0x81))
3207 device[1].class = ata_dev_try_classify(ap, 1, &err);
3209 /* is double-select really necessary? */
3210 if (device[1].class != ATA_DEV_NONE)
3211 ap->ops->dev_select(ap, 1);
3212 if (device[0].class != ATA_DEV_NONE)
3213 ap->ops->dev_select(ap, 0);
3215 /* if no devices were detected, disable this port */
3216 if ((device[0].class == ATA_DEV_NONE) &&
3217 (device[1].class == ATA_DEV_NONE))
3220 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3221 /* set up device control for ATA_FLAG_SATA_RESET */
3222 iowrite8(ap->ctl, ioaddr->ctl_addr);
3229 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3230 ap->ops->port_disable(ap);
3236 * sata_link_debounce - debounce SATA phy status
3237 * @link: ATA link to debounce SATA phy status for
3238 * @params: timing parameters { interval, duratinon, timeout } in msec
3239 * @deadline: deadline jiffies for the operation
3241 * Make sure SStatus of @link reaches stable state, determined by
3242 * holding the same value where DET is not 1 for @duration polled
3243 * every @interval, before @timeout. Timeout constraints the
3244 * beginning of the stable state. Because DET gets stuck at 1 on
3245 * some controllers after hot unplugging, this functions waits
3246 * until timeout then returns 0 if DET is stable at 1.
3248 * @timeout is further limited by @deadline. The sooner of the
3252 * Kernel thread context (may sleep)
3255 * 0 on success, -errno on failure.
3257 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3258 unsigned long deadline)
3260 unsigned long interval_msec = params[0];
3261 unsigned long duration = msecs_to_jiffies(params[1]);
3262 unsigned long last_jiffies, t;
3266 t = jiffies + msecs_to_jiffies(params[2]);
3267 if (time_before(t, deadline))
3270 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3275 last_jiffies = jiffies;
3278 msleep(interval_msec);
3279 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3285 if (cur == 1 && time_before(jiffies, deadline))
3287 if (time_after(jiffies, last_jiffies + duration))
3292 /* unstable, start over */
3294 last_jiffies = jiffies;
3296 /* Check deadline. If debouncing failed, return
3297 * -EPIPE to tell upper layer to lower link speed.
3299 if (time_after(jiffies, deadline))
3305 * sata_link_resume - resume SATA link
3306 * @link: ATA link to resume SATA
3307 * @params: timing parameters { interval, duratinon, timeout } in msec
3308 * @deadline: deadline jiffies for the operation
3310 * Resume SATA phy @link and debounce it.
3313 * Kernel thread context (may sleep)
3316 * 0 on success, -errno on failure.
3318 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3319 unsigned long deadline)
3324 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3327 scontrol = (scontrol & 0x0f0) | 0x300;
3329 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3332 /* Some PHYs react badly if SStatus is pounded immediately
3333 * after resuming. Delay 200ms before debouncing.
3337 return sata_link_debounce(link, params, deadline);
3341 * ata_std_prereset - prepare for reset
3342 * @link: ATA link to be reset
3343 * @deadline: deadline jiffies for the operation
3345 * @link is about to be reset. Initialize it. Failure from
3346 * prereset makes libata abort whole reset sequence and give up
3347 * that port, so prereset should be best-effort. It does its
3348 * best to prepare for reset sequence but if things go wrong, it
3349 * should just whine, not fail.
3352 * Kernel thread context (may sleep)
3355 * 0 on success, -errno otherwise.
3357 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3359 struct ata_port *ap = link->ap;
3360 struct ata_eh_context *ehc = &link->eh_context;
3361 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3364 /* handle link resume */
3365 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3366 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3367 ehc->i.action |= ATA_EH_HARDRESET;
3369 /* if we're about to do hardreset, nothing more to do */
3370 if (ehc->i.action & ATA_EH_HARDRESET)
3373 /* if SATA, resume link */
3374 if (ap->flags & ATA_FLAG_SATA) {
3375 rc = sata_link_resume(link, timing, deadline);
3376 /* whine about phy resume failure but proceed */
3377 if (rc && rc != -EOPNOTSUPP)
3378 ata_link_printk(link, KERN_WARNING, "failed to resume "
3379 "link for reset (errno=%d)\n", rc);
3382 /* Wait for !BSY if the controller can wait for the first D2H
3383 * Reg FIS and we don't know that no device is attached.
3385 if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
3386 rc = ata_wait_ready(ap, deadline);
3387 if (rc && rc != -ENODEV) {
3388 ata_link_printk(link, KERN_WARNING, "device not ready "
3389 "(errno=%d), forcing hardreset\n", rc);
3390 ehc->i.action |= ATA_EH_HARDRESET;
3398 * ata_std_softreset - reset host port via ATA SRST
3399 * @link: ATA link to reset
3400 * @classes: resulting classes of attached devices
3401 * @deadline: deadline jiffies for the operation
3403 * Reset host port using ATA SRST.
3406 * Kernel thread context (may sleep)
3409 * 0 on success, -errno otherwise.
3411 int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3412 unsigned long deadline)
3414 struct ata_port *ap = link->ap;
3415 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3416 unsigned int devmask = 0;
3422 if (ata_link_offline(link)) {
3423 classes[0] = ATA_DEV_NONE;
3427 /* determine if device 0/1 are present */
3428 if (ata_devchk(ap, 0))
3429 devmask |= (1 << 0);
3430 if (slave_possible && ata_devchk(ap, 1))
3431 devmask |= (1 << 1);
3433 /* select device 0 again */
3434 ap->ops->dev_select(ap, 0);
3436 /* issue bus reset */
3437 DPRINTK("about to softreset, devmask=%x\n", devmask);
3438 rc = ata_bus_softreset(ap, devmask, deadline);
3439 /* if link is occupied, -ENODEV too is an error */
3440 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
3441 ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3445 /* determine by signature whether we have ATA or ATAPI devices */
3446 classes[0] = ata_dev_try_classify(ap, 0, &err);
3447 if (slave_possible && err != 0x81)
3448 classes[1] = ata_dev_try_classify(ap, 1, &err);
3451 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3456 * sata_link_hardreset - reset link via SATA phy reset
3457 * @link: link to reset
3458 * @timing: timing parameters { interval, duratinon, timeout } in msec
3459 * @deadline: deadline jiffies for the operation
3461 * SATA phy-reset @link using DET bits of SControl register.
3464 * Kernel thread context (may sleep)
3467 * 0 on success, -errno otherwise.
3469 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3470 unsigned long deadline)
3477 if (sata_set_spd_needed(link)) {
3478 /* SATA spec says nothing about how to reconfigure
3479 * spd. To be on the safe side, turn off phy during
3480 * reconfiguration. This works for at least ICH7 AHCI
3483 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3486 scontrol = (scontrol & 0x0f0) | 0x304;
3488 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3494 /* issue phy wake/reset */
3495 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3498 scontrol = (scontrol & 0x0f0) | 0x301;
3500 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3503 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3504 * 10.4.2 says at least 1 ms.
3508 /* bring link back */
3509 rc = sata_link_resume(link, timing, deadline);
3511 DPRINTK("EXIT, rc=%d\n", rc);
3516 * sata_std_hardreset - reset host port via SATA phy reset
3517 * @link: link to reset
3518 * @class: resulting class of attached device
3519 * @deadline: deadline jiffies for the operation
3521 * SATA phy-reset host port using DET bits of SControl register,
3522 * wait for !BSY and classify the attached device.
3525 * Kernel thread context (may sleep)
3528 * 0 on success, -errno otherwise.
3530 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3531 unsigned long deadline)
3533 struct ata_port *ap = link->ap;
3534 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3540 rc = sata_link_hardreset(link, timing, deadline);
3542 ata_link_printk(link, KERN_ERR,
3543 "COMRESET failed (errno=%d)\n", rc);
3547 /* TODO: phy layer with polling, timeouts, etc. */
3548 if (ata_link_offline(link)) {
3549 *class = ATA_DEV_NONE;
3550 DPRINTK("EXIT, link offline\n");
3554 /* wait a while before checking status, see SRST for more info */
3557 rc = ata_wait_ready(ap, deadline);
3558 /* link occupied, -ENODEV too is an error */
3560 ata_link_printk(link, KERN_ERR,
3561 "COMRESET failed (errno=%d)\n", rc);
3565 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3567 *class = ata_dev_try_classify(ap, 0, NULL);
3569 DPRINTK("EXIT, class=%u\n", *class);
3574 * ata_std_postreset - standard postreset callback
3575 * @link: the target ata_link
3576 * @classes: classes of attached devices
3578 * This function is invoked after a successful reset. Note that
3579 * the device might have been reset more than once using
3580 * different reset methods before postreset is invoked.
3583 * Kernel thread context (may sleep)
3585 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3587 struct ata_port *ap = link->ap;
3592 /* print link status */
3593 sata_print_link_status(link);
3596 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3597 sata_scr_write(link, SCR_ERROR, serror);
3599 /* is double-select really necessary? */
3600 if (classes[0] != ATA_DEV_NONE)
3601 ap->ops->dev_select(ap, 1);
3602 if (classes[1] != ATA_DEV_NONE)
3603 ap->ops->dev_select(ap, 0);
3605 /* bail out if no device is present */
3606 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3607 DPRINTK("EXIT, no device\n");
3611 /* set up device control */
3612 if (ap->ioaddr.ctl_addr)
3613 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3619 * ata_dev_same_device - Determine whether new ID matches configured device
3620 * @dev: device to compare against
3621 * @new_class: class of the new device
3622 * @new_id: IDENTIFY page of the new device
3624 * Compare @new_class and @new_id against @dev and determine
3625 * whether @dev is the device indicated by @new_class and
3632 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3634 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3637 const u16 *old_id = dev->id;
3638 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3639 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3641 if (dev->class != new_class) {
3642 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3643 dev->class, new_class);
3647 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3648 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3649 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3650 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3652 if (strcmp(model[0], model[1])) {
3653 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3654 "'%s' != '%s'\n", model[0], model[1]);
3658 if (strcmp(serial[0], serial[1])) {
3659 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3660 "'%s' != '%s'\n", serial[0], serial[1]);
3668 * ata_dev_reread_id - Re-read IDENTIFY data
3669 * @dev: target ATA device
3670 * @readid_flags: read ID flags
3672 * Re-read IDENTIFY page and make sure @dev is still attached to
3676 * Kernel thread context (may sleep)
3679 * 0 on success, negative errno otherwise
3681 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3683 unsigned int class = dev->class;
3684 u16 *id = (void *)dev->link->ap->sector_buf;
3688 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3692 /* is the device still there? */
3693 if (!ata_dev_same_device(dev, class, id))
3696 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3701 * ata_dev_revalidate - Revalidate ATA device
3702 * @dev: device to revalidate
3703 * @readid_flags: read ID flags
3705 * Re-read IDENTIFY page, make sure @dev is still attached to the
3706 * port and reconfigure it according to the new IDENTIFY page.
3709 * Kernel thread context (may sleep)
3712 * 0 on success, negative errno otherwise
3714 int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3716 u64 n_sectors = dev->n_sectors;
3719 if (!ata_dev_enabled(dev))
3723 rc = ata_dev_reread_id(dev, readid_flags);
3727 /* configure device according to the new ID */
3728 rc = ata_dev_configure(dev);
3732 /* verify n_sectors hasn't changed */
3733 if (dev->class == ATA_DEV_ATA && n_sectors &&
3734 dev->n_sectors != n_sectors) {
3735 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3737 (unsigned long long)n_sectors,
3738 (unsigned long long)dev->n_sectors);
3740 /* restore original n_sectors */
3741 dev->n_sectors = n_sectors;
3750 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3754 struct ata_blacklist_entry {
3755 const char *model_num;
3756 const char *model_rev;
3757 unsigned long horkage;
3760 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3761 /* Devices with DMA related problems under Linux */
3762 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3763 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3764 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3765 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3766 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3767 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3768 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3769 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3770 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3771 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3772 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3773 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3774 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3775 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3776 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3777 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3778 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3779 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3780 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3781 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3782 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3783 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3784 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3785 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3786 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3787 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3788 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3789 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3790 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
3791 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3792 { "IOMEGA ZIP 250 ATAPI", NULL, ATA_HORKAGE_NODMA }, /* temporary fix */
3793 { "IOMEGA ZIP 250 ATAPI Floppy",
3794 NULL, ATA_HORKAGE_NODMA },
3796 /* Weird ATAPI devices */
3797 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3799 /* Devices we expect to fail diagnostics */
3801 /* Devices where NCQ should be avoided */
3803 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3804 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3805 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3807 { "Maxtor 6L250S0", "BANC1G10", ATA_HORKAGE_NONCQ },
3808 { "Maxtor 6B200M0", "BANC1BM0", ATA_HORKAGE_NONCQ },
3809 { "Maxtor 6B200M0", "BANC1B10", ATA_HORKAGE_NONCQ },
3810 { "Maxtor 7B250S0", "BANC1B70", ATA_HORKAGE_NONCQ, },
3811 { "Maxtor 7B300S0", "BANC1B70", ATA_HORKAGE_NONCQ },
3812 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3813 { "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
3814 ATA_HORKAGE_NONCQ },
3815 /* NCQ hard hangs device under heavier load, needs hard power cycle */
3816 { "Maxtor 6B250S0", "BANC1B70", ATA_HORKAGE_NONCQ },
3817 /* Blacklist entries taken from Silicon Image 3124/3132
3818 Windows driver .inf file - also several Linux problem reports */
3819 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3820 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3821 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3822 /* Drives which do spurious command completion */
3823 { "HTS541680J9SA00", "SB2IC7EP", ATA_HORKAGE_NONCQ, },
3824 { "HTS541612J9SA00", "SBDIC7JP", ATA_HORKAGE_NONCQ, },
3825 { "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
3826 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3827 { "FUJITSU MHV2080BH", "00840028", ATA_HORKAGE_NONCQ, },
3828 { "ST9160821AS", "3.CLF", ATA_HORKAGE_NONCQ, },
3829 { "ST3160812AS", "3.AD", ATA_HORKAGE_NONCQ, },
3830 { "SAMSUNG HD401LJ", "ZZ100-15", ATA_HORKAGE_NONCQ, },
3832 /* devices which puke on READ_NATIVE_MAX */
3833 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3834 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3835 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3836 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3842 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3844 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3845 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3846 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3848 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3849 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3851 while (ad->model_num) {
3852 if (!strcmp(ad->model_num, model_num)) {
3853 if (ad->model_rev == NULL)
3855 if (!strcmp(ad->model_rev, model_rev))
3863 static int ata_dma_blacklisted(const struct ata_device *dev)
3865 /* We don't support polling DMA.
3866 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3867 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3869 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3870 (dev->flags & ATA_DFLAG_CDB_INTR))
3872 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3876 * ata_dev_xfermask - Compute supported xfermask of the given device
3877 * @dev: Device to compute xfermask for
3879 * Compute supported xfermask of @dev and store it in
3880 * dev->*_mask. This function is responsible for applying all
3881 * known limits including host controller limits, device
3887 static void ata_dev_xfermask(struct ata_device *dev)
3889 struct ata_link *link = dev->link;
3890 struct ata_port *ap = link->ap;
3891 struct ata_host *host = ap->host;
3892 unsigned long xfer_mask;
3894 /* controller modes available */
3895 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3896 ap->mwdma_mask, ap->udma_mask);
3898 /* drive modes available */
3899 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
3900 dev->mwdma_mask, dev->udma_mask);
3901 xfer_mask &= ata_id_xfermask(dev->id);
3904 * CFA Advanced TrueIDE timings are not allowed on a shared
3907 if (ata_dev_pair(dev)) {
3908 /* No PIO5 or PIO6 */
3909 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
3910 /* No MWDMA3 or MWDMA 4 */
3911 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
3914 if (ata_dma_blacklisted(dev)) {
3915 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3916 ata_dev_printk(dev, KERN_WARNING,
3917 "device is on DMA blacklist, disabling DMA\n");
3920 if ((host->flags & ATA_HOST_SIMPLEX) &&
3921 host->simplex_claimed && host->simplex_claimed != ap) {
3922 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3923 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
3924 "other device, disabling DMA\n");
3927 if (ap->flags & ATA_FLAG_NO_IORDY)
3928 xfer_mask &= ata_pio_mask_no_iordy(dev);
3930 if (ap->ops->mode_filter)
3931 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3933 /* Apply cable rule here. Don't apply it early because when
3934 * we handle hot plug the cable type can itself change.
3935 * Check this last so that we know if the transfer rate was
3936 * solely limited by the cable.
3937 * Unknown or 80 wire cables reported host side are checked
3938 * drive side as well. Cases where we know a 40wire cable
3939 * is used safely for 80 are not checked here.
3941 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
3942 /* UDMA/44 or higher would be available */
3943 if((ap->cbl == ATA_CBL_PATA40) ||
3944 (ata_drive_40wire(dev->id) &&
3945 (ap->cbl == ATA_CBL_PATA_UNK ||
3946 ap->cbl == ATA_CBL_PATA80))) {
3947 ata_dev_printk(dev, KERN_WARNING,
3948 "limited to UDMA/33 due to 40-wire cable\n");
3949 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3952 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3953 &dev->mwdma_mask, &dev->udma_mask);
3957 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3958 * @dev: Device to which command will be sent
3960 * Issue SET FEATURES - XFER MODE command to device @dev
3964 * PCI/etc. bus probe sem.
3967 * 0 on success, AC_ERR_* mask otherwise.
3970 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3972 struct ata_taskfile tf;
3973 unsigned int err_mask;
3975 /* set up set-features taskfile */
3976 DPRINTK("set features - xfer mode\n");
3978 /* Some controllers and ATAPI devices show flaky interrupt
3979 * behavior after setting xfer mode. Use polling instead.
3981 ata_tf_init(dev, &tf);
3982 tf.command = ATA_CMD_SET_FEATURES;
3983 tf.feature = SETFEATURES_XFER;
3984 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3985 tf.protocol = ATA_PROT_NODATA;
3986 tf.nsect = dev->xfer_mode;
3988 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3990 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3995 * ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
3996 * @dev: Device to which command will be sent
3997 * @enable: Whether to enable or disable the feature
3999 * Issue SET FEATURES - SATA FEATURES command to device @dev
4000 * on port @ap with sector count set to indicate Asynchronous
4001 * Notification feature
4004 * PCI/etc. bus probe sem.
4007 * 0 on success, AC_ERR_* mask otherwise.
4009 static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
4011 struct ata_taskfile tf;
4012 unsigned int err_mask;
4014 /* set up set-features taskfile */
4015 DPRINTK("set features - SATA features\n");
4017 ata_tf_init(dev, &tf);
4018 tf.command = ATA_CMD_SET_FEATURES;
4019 tf.feature = enable;
4020 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4021 tf.protocol = ATA_PROT_NODATA;
4024 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4026 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4031 * ata_dev_init_params - Issue INIT DEV PARAMS command
4032 * @dev: Device to which command will be sent
4033 * @heads: Number of heads (taskfile parameter)
4034 * @sectors: Number of sectors (taskfile parameter)
4037 * Kernel thread context (may sleep)
4040 * 0 on success, AC_ERR_* mask otherwise.
4042 static unsigned int ata_dev_init_params(struct ata_device *dev,
4043 u16 heads, u16 sectors)
4045 struct ata_taskfile tf;
4046 unsigned int err_mask;
4048 /* Number of sectors per track 1-255. Number of heads 1-16 */
4049 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4050 return AC_ERR_INVALID;
4052 /* set up init dev params taskfile */
4053 DPRINTK("init dev params \n");
4055 ata_tf_init(dev, &tf);
4056 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4057 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4058 tf.protocol = ATA_PROT_NODATA;
4060 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4062 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4063 /* A clean abort indicates an original or just out of spec drive
4064 and we should continue as we issue the setup based on the
4065 drive reported working geometry */
4066 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4069 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4074 * ata_sg_clean - Unmap DMA memory associated with command
4075 * @qc: Command containing DMA memory to be released
4077 * Unmap all mapped DMA memory associated with this command.
4080 * spin_lock_irqsave(host lock)
4082 void ata_sg_clean(struct ata_queued_cmd *qc)
4084 struct ata_port *ap = qc->ap;
4085 struct scatterlist *sg = qc->__sg;
4086 int dir = qc->dma_dir;
4087 void *pad_buf = NULL;
4089 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
4090 WARN_ON(sg == NULL);
4092 if (qc->flags & ATA_QCFLAG_SINGLE)
4093 WARN_ON(qc->n_elem > 1);
4095 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4097 /* if we padded the buffer out to 32-bit bound, and data
4098 * xfer direction is from-device, we must copy from the
4099 * pad buffer back into the supplied buffer
4101 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4102 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4104 if (qc->flags & ATA_QCFLAG_SG) {
4106 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4107 /* restore last sg */
4108 sg[qc->orig_n_elem - 1].length += qc->pad_len;
4110 struct scatterlist *psg = &qc->pad_sgent;
4111 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4112 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4113 kunmap_atomic(addr, KM_IRQ0);
4117 dma_unmap_single(ap->dev,
4118 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4121 sg->length += qc->pad_len;
4123 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4124 pad_buf, qc->pad_len);
4127 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4132 * ata_fill_sg - Fill PCI IDE PRD table
4133 * @qc: Metadata associated with taskfile to be transferred
4135 * Fill PCI IDE PRD (scatter-gather) table with segments
4136 * associated with the current disk command.
4139 * spin_lock_irqsave(host lock)
4142 static void ata_fill_sg(struct ata_queued_cmd *qc)
4144 struct ata_port *ap = qc->ap;
4145 struct scatterlist *sg;
4148 WARN_ON(qc->__sg == NULL);
4149 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4152 ata_for_each_sg(sg, qc) {
4156 /* determine if physical DMA addr spans 64K boundary.
4157 * Note h/w doesn't support 64-bit, so we unconditionally
4158 * truncate dma_addr_t to u32.
4160 addr = (u32) sg_dma_address(sg);
4161 sg_len = sg_dma_len(sg);
4164 offset = addr & 0xffff;
4166 if ((offset + sg_len) > 0x10000)
4167 len = 0x10000 - offset;
4169 ap->prd[idx].addr = cpu_to_le32(addr);
4170 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4171 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4180 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4184 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4185 * @qc: Metadata associated with taskfile to be transferred
4187 * Fill PCI IDE PRD (scatter-gather) table with segments
4188 * associated with the current disk command. Perform the fill
4189 * so that we avoid writing any length 64K records for
4190 * controllers that don't follow the spec.
4193 * spin_lock_irqsave(host lock)
4196 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4198 struct ata_port *ap = qc->ap;
4199 struct scatterlist *sg;
4202 WARN_ON(qc->__sg == NULL);
4203 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4206 ata_for_each_sg(sg, qc) {
4208 u32 sg_len, len, blen;
4210 /* determine if physical DMA addr spans 64K boundary.
4211 * Note h/w doesn't support 64-bit, so we unconditionally
4212 * truncate dma_addr_t to u32.
4214 addr = (u32) sg_dma_address(sg);
4215 sg_len = sg_dma_len(sg);
4218 offset = addr & 0xffff;
4220 if ((offset + sg_len) > 0x10000)
4221 len = 0x10000 - offset;
4223 blen = len & 0xffff;
4224 ap->prd[idx].addr = cpu_to_le32(addr);
4226 /* Some PATA chipsets like the CS5530 can't
4227 cope with 0x0000 meaning 64K as the spec says */
4228 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4230 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4232 ap->prd[idx].flags_len = cpu_to_le32(blen);
4233 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4242 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4246 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4247 * @qc: Metadata associated with taskfile to check
4249 * Allow low-level driver to filter ATA PACKET commands, returning
4250 * a status indicating whether or not it is OK to use DMA for the
4251 * supplied PACKET command.
4254 * spin_lock_irqsave(host lock)
4256 * RETURNS: 0 when ATAPI DMA can be used
4259 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4261 struct ata_port *ap = qc->ap;
4263 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4264 * few ATAPI devices choke on such DMA requests.
4266 if (unlikely(qc->nbytes & 15))
4269 if (ap->ops->check_atapi_dma)
4270 return ap->ops->check_atapi_dma(qc);
4276 * ata_qc_prep - Prepare taskfile for submission
4277 * @qc: Metadata associated with taskfile to be prepared
4279 * Prepare ATA taskfile for submission.
4282 * spin_lock_irqsave(host lock)
4284 void ata_qc_prep(struct ata_queued_cmd *qc)
4286 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4293 * ata_dumb_qc_prep - Prepare taskfile for submission
4294 * @qc: Metadata associated with taskfile to be prepared
4296 * Prepare ATA taskfile for submission.
4299 * spin_lock_irqsave(host lock)
4301 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4303 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4306 ata_fill_sg_dumb(qc);
4309 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4312 * ata_sg_init_one - Associate command with memory buffer
4313 * @qc: Command to be associated
4314 * @buf: Memory buffer
4315 * @buflen: Length of memory buffer, in bytes.
4317 * Initialize the data-related elements of queued_cmd @qc
4318 * to point to a single memory buffer, @buf of byte length @buflen.
4321 * spin_lock_irqsave(host lock)
4324 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4326 qc->flags |= ATA_QCFLAG_SINGLE;
4328 qc->__sg = &qc->sgent;
4330 qc->orig_n_elem = 1;
4332 qc->nbytes = buflen;
4334 sg_init_one(&qc->sgent, buf, buflen);
4338 * ata_sg_init - Associate command with scatter-gather table.
4339 * @qc: Command to be associated
4340 * @sg: Scatter-gather table.
4341 * @n_elem: Number of elements in s/g table.
4343 * Initialize the data-related elements of queued_cmd @qc
4344 * to point to a scatter-gather table @sg, containing @n_elem
4348 * spin_lock_irqsave(host lock)
4351 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4352 unsigned int n_elem)
4354 qc->flags |= ATA_QCFLAG_SG;
4356 qc->n_elem = n_elem;
4357 qc->orig_n_elem = n_elem;
4361 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4362 * @qc: Command with memory buffer to be mapped.
4364 * DMA-map the memory buffer associated with queued_cmd @qc.
4367 * spin_lock_irqsave(host lock)
4370 * Zero on success, negative on error.
4373 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4375 struct ata_port *ap = qc->ap;
4376 int dir = qc->dma_dir;
4377 struct scatterlist *sg = qc->__sg;
4378 dma_addr_t dma_address;
4381 /* we must lengthen transfers to end on a 32-bit boundary */
4382 qc->pad_len = sg->length & 3;
4384 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4385 struct scatterlist *psg = &qc->pad_sgent;
4387 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4389 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4391 if (qc->tf.flags & ATA_TFLAG_WRITE)
4392 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4395 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4396 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4398 sg->length -= qc->pad_len;
4399 if (sg->length == 0)
4402 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4403 sg->length, qc->pad_len);
4411 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4413 if (dma_mapping_error(dma_address)) {
4415 sg->length += qc->pad_len;
4419 sg_dma_address(sg) = dma_address;
4420 sg_dma_len(sg) = sg->length;
4423 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4424 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4430 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4431 * @qc: Command with scatter-gather table to be mapped.
4433 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4436 * spin_lock_irqsave(host lock)
4439 * Zero on success, negative on error.
4443 static int ata_sg_setup(struct ata_queued_cmd *qc)
4445 struct ata_port *ap = qc->ap;
4446 struct scatterlist *sg = qc->__sg;
4447 struct scatterlist *lsg = &sg[qc->n_elem - 1];
4448 int n_elem, pre_n_elem, dir, trim_sg = 0;
4450 VPRINTK("ENTER, ata%u\n", ap->print_id);
4451 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4453 /* we must lengthen transfers to end on a 32-bit boundary */
4454 qc->pad_len = lsg->length & 3;
4456 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4457 struct scatterlist *psg = &qc->pad_sgent;
4458 unsigned int offset;
4460 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4462 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4465 * psg->page/offset are used to copy to-be-written
4466 * data in this function or read data in ata_sg_clean.
4468 offset = lsg->offset + lsg->length - qc->pad_len;
4469 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
4470 psg->offset = offset_in_page(offset);
4472 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4473 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4474 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4475 kunmap_atomic(addr, KM_IRQ0);
4478 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4479 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4481 lsg->length -= qc->pad_len;
4482 if (lsg->length == 0)
4485 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4486 qc->n_elem - 1, lsg->length, qc->pad_len);
4489 pre_n_elem = qc->n_elem;
4490 if (trim_sg && pre_n_elem)
4499 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4501 /* restore last sg */
4502 lsg->length += qc->pad_len;
4506 DPRINTK("%d sg elements mapped\n", n_elem);
4509 qc->n_elem = n_elem;
4515 * swap_buf_le16 - swap halves of 16-bit words in place
4516 * @buf: Buffer to swap
4517 * @buf_words: Number of 16-bit words in buffer.
4519 * Swap halves of 16-bit words if needed to convert from
4520 * little-endian byte order to native cpu byte order, or
4524 * Inherited from caller.
4526 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4531 for (i = 0; i < buf_words; i++)
4532 buf[i] = le16_to_cpu(buf[i]);
4533 #endif /* __BIG_ENDIAN */
4537 * ata_data_xfer - Transfer data by PIO
4538 * @adev: device to target
4540 * @buflen: buffer length
4541 * @write_data: read/write
4543 * Transfer data from/to the device data register by PIO.
4546 * Inherited from caller.
4548 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
4549 unsigned int buflen, int write_data)
4551 struct ata_port *ap = adev->link->ap;
4552 unsigned int words = buflen >> 1;
4554 /* Transfer multiple of 2 bytes */
4556 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
4558 ioread16_rep(ap->ioaddr.data_addr, buf, words);
4560 /* Transfer trailing 1 byte, if any. */
4561 if (unlikely(buflen & 0x01)) {
4562 u16 align_buf[1] = { 0 };
4563 unsigned char *trailing_buf = buf + buflen - 1;
4566 memcpy(align_buf, trailing_buf, 1);
4567 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
4569 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
4570 memcpy(trailing_buf, align_buf, 1);
4576 * ata_data_xfer_noirq - Transfer data by PIO
4577 * @adev: device to target
4579 * @buflen: buffer length
4580 * @write_data: read/write
4582 * Transfer data from/to the device data register by PIO. Do the
4583 * transfer with interrupts disabled.
4586 * Inherited from caller.
4588 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
4589 unsigned int buflen, int write_data)
4591 unsigned long flags;
4592 local_irq_save(flags);
4593 ata_data_xfer(adev, buf, buflen, write_data);
4594 local_irq_restore(flags);
4599 * ata_pio_sector - Transfer a sector of data.
4600 * @qc: Command on going
4602 * Transfer qc->sect_size bytes of data from/to the ATA device.
4605 * Inherited from caller.
4608 static void ata_pio_sector(struct ata_queued_cmd *qc)
4610 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4611 struct scatterlist *sg = qc->__sg;
4612 struct ata_port *ap = qc->ap;
4614 unsigned int offset;
4617 if (qc->curbytes == qc->nbytes - qc->sect_size)
4618 ap->hsm_task_state = HSM_ST_LAST;
4620 page = sg[qc->cursg].page;
4621 offset = sg[qc->cursg].offset + qc->cursg_ofs;
4623 /* get the current page and offset */
4624 page = nth_page(page, (offset >> PAGE_SHIFT));
4625 offset %= PAGE_SIZE;
4627 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4629 if (PageHighMem(page)) {
4630 unsigned long flags;
4632 /* FIXME: use a bounce buffer */
4633 local_irq_save(flags);
4634 buf = kmap_atomic(page, KM_IRQ0);
4636 /* do the actual data transfer */
4637 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4639 kunmap_atomic(buf, KM_IRQ0);
4640 local_irq_restore(flags);
4642 buf = page_address(page);
4643 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4646 qc->curbytes += qc->sect_size;
4647 qc->cursg_ofs += qc->sect_size;
4649 if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
4656 * ata_pio_sectors - Transfer one or many sectors.
4657 * @qc: Command on going
4659 * Transfer one or many sectors of data from/to the
4660 * ATA device for the DRQ request.
4663 * Inherited from caller.
4666 static void ata_pio_sectors(struct ata_queued_cmd *qc)
4668 if (is_multi_taskfile(&qc->tf)) {
4669 /* READ/WRITE MULTIPLE */
4672 WARN_ON(qc->dev->multi_count == 0);
4674 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
4675 qc->dev->multi_count);
4681 ata_altstatus(qc->ap); /* flush */
4685 * atapi_send_cdb - Write CDB bytes to hardware
4686 * @ap: Port to which ATAPI device is attached.
4687 * @qc: Taskfile currently active
4689 * When device has indicated its readiness to accept
4690 * a CDB, this function is called. Send the CDB.
4696 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
4699 DPRINTK("send cdb\n");
4700 WARN_ON(qc->dev->cdb_len < 12);
4702 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4703 ata_altstatus(ap); /* flush */
4705 switch (qc->tf.protocol) {
4706 case ATA_PROT_ATAPI:
4707 ap->hsm_task_state = HSM_ST;
4709 case ATA_PROT_ATAPI_NODATA:
4710 ap->hsm_task_state = HSM_ST_LAST;
4712 case ATA_PROT_ATAPI_DMA:
4713 ap->hsm_task_state = HSM_ST_LAST;
4714 /* initiate bmdma */
4715 ap->ops->bmdma_start(qc);
4721 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
4722 * @qc: Command on going
4723 * @bytes: number of bytes
4725 * Transfer Transfer data from/to the ATAPI device.
4728 * Inherited from caller.
4732 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
4734 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4735 struct scatterlist *sg = qc->__sg;
4736 struct ata_port *ap = qc->ap;
4739 unsigned int offset, count;
4741 if (qc->curbytes + bytes >= qc->nbytes)
4742 ap->hsm_task_state = HSM_ST_LAST;
4745 if (unlikely(qc->cursg >= qc->n_elem)) {
4747 * The end of qc->sg is reached and the device expects
4748 * more data to transfer. In order not to overrun qc->sg
4749 * and fulfill length specified in the byte count register,
4750 * - for read case, discard trailing data from the device
4751 * - for write case, padding zero data to the device
4753 u16 pad_buf[1] = { 0 };
4754 unsigned int words = bytes >> 1;
4757 if (words) /* warning if bytes > 1 */
4758 ata_dev_printk(qc->dev, KERN_WARNING,
4759 "%u bytes trailing data\n", bytes);
4761 for (i = 0; i < words; i++)
4762 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4764 ap->hsm_task_state = HSM_ST_LAST;
4768 sg = &qc->__sg[qc->cursg];
4771 offset = sg->offset + qc->cursg_ofs;
4773 /* get the current page and offset */
4774 page = nth_page(page, (offset >> PAGE_SHIFT));
4775 offset %= PAGE_SIZE;
4777 /* don't overrun current sg */
4778 count = min(sg->length - qc->cursg_ofs, bytes);
4780 /* don't cross page boundaries */
4781 count = min(count, (unsigned int)PAGE_SIZE - offset);
4783 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4785 if (PageHighMem(page)) {
4786 unsigned long flags;
4788 /* FIXME: use bounce buffer */
4789 local_irq_save(flags);
4790 buf = kmap_atomic(page, KM_IRQ0);
4792 /* do the actual data transfer */
4793 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4795 kunmap_atomic(buf, KM_IRQ0);
4796 local_irq_restore(flags);
4798 buf = page_address(page);
4799 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4803 qc->curbytes += count;
4804 qc->cursg_ofs += count;
4806 if (qc->cursg_ofs == sg->length) {
4816 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4817 * @qc: Command on going
4819 * Transfer Transfer data from/to the ATAPI device.
4822 * Inherited from caller.
4825 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
4827 struct ata_port *ap = qc->ap;
4828 struct ata_device *dev = qc->dev;
4829 unsigned int ireason, bc_lo, bc_hi, bytes;
4830 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
4832 /* Abuse qc->result_tf for temp storage of intermediate TF
4833 * here to save some kernel stack usage.
4834 * For normal completion, qc->result_tf is not relevant. For
4835 * error, qc->result_tf is later overwritten by ata_qc_complete().
4836 * So, the correctness of qc->result_tf is not affected.
4838 ap->ops->tf_read(ap, &qc->result_tf);
4839 ireason = qc->result_tf.nsect;
4840 bc_lo = qc->result_tf.lbam;
4841 bc_hi = qc->result_tf.lbah;
4842 bytes = (bc_hi << 8) | bc_lo;
4844 /* shall be cleared to zero, indicating xfer of data */
4845 if (ireason & (1 << 0))
4848 /* make sure transfer direction matches expected */
4849 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
4850 if (do_write != i_write)
4853 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4855 __atapi_pio_bytes(qc, bytes);
4856 ata_altstatus(ap); /* flush */
4861 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4862 qc->err_mask |= AC_ERR_HSM;
4863 ap->hsm_task_state = HSM_ST_ERR;
4867 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4868 * @ap: the target ata_port
4872 * 1 if ok in workqueue, 0 otherwise.
4875 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
4877 if (qc->tf.flags & ATA_TFLAG_POLLING)
4880 if (ap->hsm_task_state == HSM_ST_FIRST) {
4881 if (qc->tf.protocol == ATA_PROT_PIO &&
4882 (qc->tf.flags & ATA_TFLAG_WRITE))
4885 if (is_atapi_taskfile(&qc->tf) &&
4886 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4894 * ata_hsm_qc_complete - finish a qc running on standard HSM
4895 * @qc: Command to complete
4896 * @in_wq: 1 if called from workqueue, 0 otherwise
4898 * Finish @qc which is running on standard HSM.
4901 * If @in_wq is zero, spin_lock_irqsave(host lock).
4902 * Otherwise, none on entry and grabs host lock.
4904 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
4906 struct ata_port *ap = qc->ap;
4907 unsigned long flags;
4909 if (ap->ops->error_handler) {
4911 spin_lock_irqsave(ap->lock, flags);
4913 /* EH might have kicked in while host lock is
4916 qc = ata_qc_from_tag(ap, qc->tag);
4918 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4919 ap->ops->irq_on(ap);
4920 ata_qc_complete(qc);
4922 ata_port_freeze(ap);
4925 spin_unlock_irqrestore(ap->lock, flags);
4927 if (likely(!(qc->err_mask & AC_ERR_HSM)))
4928 ata_qc_complete(qc);
4930 ata_port_freeze(ap);
4934 spin_lock_irqsave(ap->lock, flags);
4935 ap->ops->irq_on(ap);
4936 ata_qc_complete(qc);
4937 spin_unlock_irqrestore(ap->lock, flags);
4939 ata_qc_complete(qc);
4944 * ata_hsm_move - move the HSM to the next state.
4945 * @ap: the target ata_port
4947 * @status: current device status
4948 * @in_wq: 1 if called from workqueue, 0 otherwise
4951 * 1 when poll next status needed, 0 otherwise.
4953 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
4954 u8 status, int in_wq)
4956 unsigned long flags = 0;
4959 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
4961 /* Make sure ata_qc_issue_prot() does not throw things
4962 * like DMA polling into the workqueue. Notice that
4963 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4965 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4968 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4969 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4971 switch (ap->hsm_task_state) {
4973 /* Send first data block or PACKET CDB */
4975 /* If polling, we will stay in the work queue after
4976 * sending the data. Otherwise, interrupt handler
4977 * takes over after sending the data.
4979 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
4981 /* check device status */
4982 if (unlikely((status & ATA_DRQ) == 0)) {
4983 /* handle BSY=0, DRQ=0 as error */
4984 if (likely(status & (ATA_ERR | ATA_DF)))
4985 /* device stops HSM for abort/error */
4986 qc->err_mask |= AC_ERR_DEV;
4988 /* HSM violation. Let EH handle this */
4989 qc->err_mask |= AC_ERR_HSM;
4991 ap->hsm_task_state = HSM_ST_ERR;
4995 /* Device should not ask for data transfer (DRQ=1)
4996 * when it finds something wrong.
4997 * We ignore DRQ here and stop the HSM by
4998 * changing hsm_task_state to HSM_ST_ERR and
4999 * let the EH abort the command or reset the device.
5001 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5002 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
5003 "error, dev_stat 0x%X\n", status);
5004 qc->err_mask |= AC_ERR_HSM;
5005 ap->hsm_task_state = HSM_ST_ERR;
5009 /* Send the CDB (atapi) or the first data block (ata pio out).
5010 * During the state transition, interrupt handler shouldn't
5011 * be invoked before the data transfer is complete and
5012 * hsm_task_state is changed. Hence, the following locking.
5015 spin_lock_irqsave(ap->lock, flags);
5017 if (qc->tf.protocol == ATA_PROT_PIO) {
5018 /* PIO data out protocol.
5019 * send first data block.
5022 /* ata_pio_sectors() might change the state
5023 * to HSM_ST_LAST. so, the state is changed here
5024 * before ata_pio_sectors().
5026 ap->hsm_task_state = HSM_ST;
5027 ata_pio_sectors(qc);
5030 atapi_send_cdb(ap, qc);
5033 spin_unlock_irqrestore(ap->lock, flags);
5035 /* if polling, ata_pio_task() handles the rest.
5036 * otherwise, interrupt handler takes over from here.
5041 /* complete command or read/write the data register */
5042 if (qc->tf.protocol == ATA_PROT_ATAPI) {
5043 /* ATAPI PIO protocol */
5044 if ((status & ATA_DRQ) == 0) {
5045 /* No more data to transfer or device error.
5046 * Device error will be tagged in HSM_ST_LAST.
5048 ap->hsm_task_state = HSM_ST_LAST;
5052 /* Device should not ask for data transfer (DRQ=1)
5053 * when it finds something wrong.
5054 * We ignore DRQ here and stop the HSM by
5055 * changing hsm_task_state to HSM_ST_ERR and
5056 * let the EH abort the command or reset the device.
5058 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5059 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
5060 "device error, dev_stat 0x%X\n",
5062 qc->err_mask |= AC_ERR_HSM;
5063 ap->hsm_task_state = HSM_ST_ERR;
5067 atapi_pio_bytes(qc);
5069 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
5070 /* bad ireason reported by device */
5074 /* ATA PIO protocol */
5075 if (unlikely((status & ATA_DRQ) == 0)) {
5076 /* handle BSY=0, DRQ=0 as error */
5077 if (likely(status & (ATA_ERR | ATA_DF)))
5078 /* device stops HSM for abort/error */
5079 qc->err_mask |= AC_ERR_DEV;
5081 /* HSM violation. Let EH handle this.
5082 * Phantom devices also trigger this
5083 * condition. Mark hint.
5085 qc->err_mask |= AC_ERR_HSM |
5088 ap->hsm_task_state = HSM_ST_ERR;
5092 /* For PIO reads, some devices may ask for
5093 * data transfer (DRQ=1) alone with ERR=1.
5094 * We respect DRQ here and transfer one
5095 * block of junk data before changing the
5096 * hsm_task_state to HSM_ST_ERR.
5098 * For PIO writes, ERR=1 DRQ=1 doesn't make
5099 * sense since the data block has been
5100 * transferred to the device.
5102 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5103 /* data might be corrputed */
5104 qc->err_mask |= AC_ERR_DEV;
5106 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5107 ata_pio_sectors(qc);
5108 status = ata_wait_idle(ap);
5111 if (status & (ATA_BUSY | ATA_DRQ))
5112 qc->err_mask |= AC_ERR_HSM;
5114 /* ata_pio_sectors() might change the
5115 * state to HSM_ST_LAST. so, the state
5116 * is changed after ata_pio_sectors().
5118 ap->hsm_task_state = HSM_ST_ERR;
5122 ata_pio_sectors(qc);
5124 if (ap->hsm_task_state == HSM_ST_LAST &&
5125 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5127 status = ata_wait_idle(ap);
5136 if (unlikely(!ata_ok(status))) {
5137 qc->err_mask |= __ac_err_mask(status);
5138 ap->hsm_task_state = HSM_ST_ERR;
5142 /* no more data to transfer */
5143 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5144 ap->print_id, qc->dev->devno, status);
5146 WARN_ON(qc->err_mask);
5148 ap->hsm_task_state = HSM_ST_IDLE;
5150 /* complete taskfile transaction */
5151 ata_hsm_qc_complete(qc, in_wq);
5157 /* make sure qc->err_mask is available to
5158 * know what's wrong and recover
5160 WARN_ON(qc->err_mask == 0);
5162 ap->hsm_task_state = HSM_ST_IDLE;
5164 /* complete taskfile transaction */
5165 ata_hsm_qc_complete(qc, in_wq);
5177 static void ata_pio_task(struct work_struct *work)
5179 struct ata_port *ap =
5180 container_of(work, struct ata_port, port_task.work);
5181 struct ata_queued_cmd *qc = ap->port_task_data;
5186 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5189 * This is purely heuristic. This is a fast path.
5190 * Sometimes when we enter, BSY will be cleared in
5191 * a chk-status or two. If not, the drive is probably seeking
5192 * or something. Snooze for a couple msecs, then
5193 * chk-status again. If still busy, queue delayed work.
5195 status = ata_busy_wait(ap, ATA_BUSY, 5);
5196 if (status & ATA_BUSY) {
5198 status = ata_busy_wait(ap, ATA_BUSY, 10);
5199 if (status & ATA_BUSY) {
5200 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5206 poll_next = ata_hsm_move(ap, qc, status, 1);
5208 /* another command or interrupt handler
5209 * may be running at this point.
5216 * ata_qc_new - Request an available ATA command, for queueing
5217 * @ap: Port associated with device @dev
5218 * @dev: Device from whom we request an available command structure
5224 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5226 struct ata_queued_cmd *qc = NULL;
5229 /* no command while frozen */
5230 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5233 /* the last tag is reserved for internal command. */
5234 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5235 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5236 qc = __ata_qc_from_tag(ap, i);
5247 * ata_qc_new_init - Request an available ATA command, and initialize it
5248 * @dev: Device from whom we request an available command structure
5254 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5256 struct ata_port *ap = dev->link->ap;
5257 struct ata_queued_cmd *qc;
5259 qc = ata_qc_new(ap);
5272 * ata_qc_free - free unused ata_queued_cmd
5273 * @qc: Command to complete
5275 * Designed to free unused ata_queued_cmd object
5276 * in case something prevents using it.
5279 * spin_lock_irqsave(host lock)
5281 void ata_qc_free(struct ata_queued_cmd *qc)
5283 struct ata_port *ap = qc->ap;
5286 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5290 if (likely(ata_tag_valid(tag))) {
5291 qc->tag = ATA_TAG_POISON;
5292 clear_bit(tag, &ap->qc_allocated);
5296 void __ata_qc_complete(struct ata_queued_cmd *qc)
5298 struct ata_port *ap = qc->ap;
5299 struct ata_link *link = qc->dev->link;
5301 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5302 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5304 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5307 /* command should be marked inactive atomically with qc completion */
5308 if (qc->tf.protocol == ATA_PROT_NCQ)
5309 link->sactive &= ~(1 << qc->tag);
5311 link->active_tag = ATA_TAG_POISON;
5313 /* atapi: mark qc as inactive to prevent the interrupt handler
5314 * from completing the command twice later, before the error handler
5315 * is called. (when rc != 0 and atapi request sense is needed)
5317 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5318 ap->qc_active &= ~(1 << qc->tag);
5320 /* call completion callback */
5321 qc->complete_fn(qc);
5324 static void fill_result_tf(struct ata_queued_cmd *qc)
5326 struct ata_port *ap = qc->ap;
5328 qc->result_tf.flags = qc->tf.flags;
5329 ap->ops->tf_read(ap, &qc->result_tf);
5333 * ata_qc_complete - Complete an active ATA command
5334 * @qc: Command to complete
5335 * @err_mask: ATA Status register contents
5337 * Indicate to the mid and upper layers that an ATA
5338 * command has completed, with either an ok or not-ok status.
5341 * spin_lock_irqsave(host lock)
5343 void ata_qc_complete(struct ata_queued_cmd *qc)
5345 struct ata_port *ap = qc->ap;
5347 /* XXX: New EH and old EH use different mechanisms to
5348 * synchronize EH with regular execution path.
5350 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5351 * Normal execution path is responsible for not accessing a
5352 * failed qc. libata core enforces the rule by returning NULL
5353 * from ata_qc_from_tag() for failed qcs.
5355 * Old EH depends on ata_qc_complete() nullifying completion
5356 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5357 * not synchronize with interrupt handler. Only PIO task is
5360 if (ap->ops->error_handler) {
5361 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5363 if (unlikely(qc->err_mask))
5364 qc->flags |= ATA_QCFLAG_FAILED;
5366 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5367 if (!ata_tag_internal(qc->tag)) {
5368 /* always fill result TF for failed qc */
5370 ata_qc_schedule_eh(qc);
5375 /* read result TF if requested */
5376 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5379 __ata_qc_complete(qc);
5381 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5384 /* read result TF if failed or requested */
5385 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5388 __ata_qc_complete(qc);
5393 * ata_qc_complete_multiple - Complete multiple qcs successfully
5394 * @ap: port in question
5395 * @qc_active: new qc_active mask
5396 * @finish_qc: LLDD callback invoked before completing a qc
5398 * Complete in-flight commands. This functions is meant to be
5399 * called from low-level driver's interrupt routine to complete
5400 * requests normally. ap->qc_active and @qc_active is compared
5401 * and commands are completed accordingly.
5404 * spin_lock_irqsave(host lock)
5407 * Number of completed commands on success, -errno otherwise.
5409 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5410 void (*finish_qc)(struct ata_queued_cmd *))
5416 done_mask = ap->qc_active ^ qc_active;
5418 if (unlikely(done_mask & qc_active)) {
5419 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5420 "(%08x->%08x)\n", ap->qc_active, qc_active);
5424 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5425 struct ata_queued_cmd *qc;
5427 if (!(done_mask & (1 << i)))
5430 if ((qc = ata_qc_from_tag(ap, i))) {
5433 ata_qc_complete(qc);
5441 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
5443 struct ata_port *ap = qc->ap;
5445 switch (qc->tf.protocol) {
5448 case ATA_PROT_ATAPI_DMA:
5451 case ATA_PROT_ATAPI:
5453 if (ap->flags & ATA_FLAG_PIO_DMA)
5466 * ata_qc_issue - issue taskfile to device
5467 * @qc: command to issue to device
5469 * Prepare an ATA command to submission to device.
5470 * This includes mapping the data into a DMA-able
5471 * area, filling in the S/G table, and finally
5472 * writing the taskfile to hardware, starting the command.
5475 * spin_lock_irqsave(host lock)
5477 void ata_qc_issue(struct ata_queued_cmd *qc)
5479 struct ata_port *ap = qc->ap;
5480 struct ata_link *link = qc->dev->link;
5482 /* Make sure only one non-NCQ command is outstanding. The
5483 * check is skipped for old EH because it reuses active qc to
5484 * request ATAPI sense.
5486 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5488 if (qc->tf.protocol == ATA_PROT_NCQ) {
5489 WARN_ON(link->sactive & (1 << qc->tag));
5490 link->sactive |= 1 << qc->tag;
5492 WARN_ON(link->sactive);
5493 link->active_tag = qc->tag;
5496 qc->flags |= ATA_QCFLAG_ACTIVE;
5497 ap->qc_active |= 1 << qc->tag;
5499 if (ata_should_dma_map(qc)) {
5500 if (qc->flags & ATA_QCFLAG_SG) {
5501 if (ata_sg_setup(qc))
5503 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
5504 if (ata_sg_setup_one(qc))
5508 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5511 ap->ops->qc_prep(qc);
5513 qc->err_mask |= ap->ops->qc_issue(qc);
5514 if (unlikely(qc->err_mask))
5519 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5520 qc->err_mask |= AC_ERR_SYSTEM;
5522 ata_qc_complete(qc);
5526 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
5527 * @qc: command to issue to device
5529 * Using various libata functions and hooks, this function
5530 * starts an ATA command. ATA commands are grouped into
5531 * classes called "protocols", and issuing each type of protocol
5532 * is slightly different.
5534 * May be used as the qc_issue() entry in ata_port_operations.
5537 * spin_lock_irqsave(host lock)
5540 * Zero on success, AC_ERR_* mask on failure
5543 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
5545 struct ata_port *ap = qc->ap;
5547 /* Use polling pio if the LLD doesn't handle
5548 * interrupt driven pio and atapi CDB interrupt.
5550 if (ap->flags & ATA_FLAG_PIO_POLLING) {
5551 switch (qc->tf.protocol) {
5553 case ATA_PROT_NODATA:
5554 case ATA_PROT_ATAPI:
5555 case ATA_PROT_ATAPI_NODATA:
5556 qc->tf.flags |= ATA_TFLAG_POLLING;
5558 case ATA_PROT_ATAPI_DMA:
5559 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5560 /* see ata_dma_blacklisted() */
5568 /* select the device */
5569 ata_dev_select(ap, qc->dev->devno, 1, 0);
5571 /* start the command */
5572 switch (qc->tf.protocol) {
5573 case ATA_PROT_NODATA:
5574 if (qc->tf.flags & ATA_TFLAG_POLLING)
5575 ata_qc_set_polling(qc);
5577 ata_tf_to_host(ap, &qc->tf);
5578 ap->hsm_task_state = HSM_ST_LAST;
5580 if (qc->tf.flags & ATA_TFLAG_POLLING)
5581 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5586 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5588 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5589 ap->ops->bmdma_setup(qc); /* set up bmdma */
5590 ap->ops->bmdma_start(qc); /* initiate bmdma */
5591 ap->hsm_task_state = HSM_ST_LAST;
5595 if (qc->tf.flags & ATA_TFLAG_POLLING)
5596 ata_qc_set_polling(qc);
5598 ata_tf_to_host(ap, &qc->tf);
5600 if (qc->tf.flags & ATA_TFLAG_WRITE) {
5601 /* PIO data out protocol */
5602 ap->hsm_task_state = HSM_ST_FIRST;
5603 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5605 /* always send first data block using
5606 * the ata_pio_task() codepath.
5609 /* PIO data in protocol */
5610 ap->hsm_task_state = HSM_ST;
5612 if (qc->tf.flags & ATA_TFLAG_POLLING)
5613 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5615 /* if polling, ata_pio_task() handles the rest.
5616 * otherwise, interrupt handler takes over from here.
5622 case ATA_PROT_ATAPI:
5623 case ATA_PROT_ATAPI_NODATA:
5624 if (qc->tf.flags & ATA_TFLAG_POLLING)
5625 ata_qc_set_polling(qc);
5627 ata_tf_to_host(ap, &qc->tf);
5629 ap->hsm_task_state = HSM_ST_FIRST;
5631 /* send cdb by polling if no cdb interrupt */
5632 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
5633 (qc->tf.flags & ATA_TFLAG_POLLING))
5634 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5637 case ATA_PROT_ATAPI_DMA:
5638 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5640 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5641 ap->ops->bmdma_setup(qc); /* set up bmdma */
5642 ap->hsm_task_state = HSM_ST_FIRST;
5644 /* send cdb by polling if no cdb interrupt */
5645 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5646 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5651 return AC_ERR_SYSTEM;
5658 * ata_host_intr - Handle host interrupt for given (port, task)
5659 * @ap: Port on which interrupt arrived (possibly...)
5660 * @qc: Taskfile currently active in engine
5662 * Handle host interrupt for given queued command. Currently,
5663 * only DMA interrupts are handled. All other commands are
5664 * handled via polling with interrupts disabled (nIEN bit).
5667 * spin_lock_irqsave(host lock)
5670 * One if interrupt was handled, zero if not (shared irq).
5673 inline unsigned int ata_host_intr (struct ata_port *ap,
5674 struct ata_queued_cmd *qc)
5676 struct ata_eh_info *ehi = &ap->link.eh_info;
5677 u8 status, host_stat = 0;
5679 VPRINTK("ata%u: protocol %d task_state %d\n",
5680 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
5682 /* Check whether we are expecting interrupt in this state */
5683 switch (ap->hsm_task_state) {
5685 /* Some pre-ATAPI-4 devices assert INTRQ
5686 * at this state when ready to receive CDB.
5689 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
5690 * The flag was turned on only for atapi devices.
5691 * No need to check is_atapi_taskfile(&qc->tf) again.
5693 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5697 if (qc->tf.protocol == ATA_PROT_DMA ||
5698 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
5699 /* check status of DMA engine */
5700 host_stat = ap->ops->bmdma_status(ap);
5701 VPRINTK("ata%u: host_stat 0x%X\n",
5702 ap->print_id, host_stat);
5704 /* if it's not our irq... */
5705 if (!(host_stat & ATA_DMA_INTR))
5708 /* before we do anything else, clear DMA-Start bit */
5709 ap->ops->bmdma_stop(qc);
5711 if (unlikely(host_stat & ATA_DMA_ERR)) {
5712 /* error when transfering data to/from memory */
5713 qc->err_mask |= AC_ERR_HOST_BUS;
5714 ap->hsm_task_state = HSM_ST_ERR;
5724 /* check altstatus */
5725 status = ata_altstatus(ap);
5726 if (status & ATA_BUSY)
5729 /* check main status, clearing INTRQ */
5730 status = ata_chk_status(ap);
5731 if (unlikely(status & ATA_BUSY))
5734 /* ack bmdma irq events */
5735 ap->ops->irq_clear(ap);
5737 ata_hsm_move(ap, qc, status, 0);
5739 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
5740 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
5741 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
5743 return 1; /* irq handled */
5746 ap->stats.idle_irq++;
5749 if ((ap->stats.idle_irq % 1000) == 0) {
5751 ap->ops->irq_clear(ap);
5752 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5756 return 0; /* irq not handled */
5760 * ata_interrupt - Default ATA host interrupt handler
5761 * @irq: irq line (unused)
5762 * @dev_instance: pointer to our ata_host information structure
5764 * Default interrupt handler for PCI IDE devices. Calls
5765 * ata_host_intr() for each port that is not disabled.
5768 * Obtains host lock during operation.
5771 * IRQ_NONE or IRQ_HANDLED.
5774 irqreturn_t ata_interrupt (int irq, void *dev_instance)
5776 struct ata_host *host = dev_instance;
5778 unsigned int handled = 0;
5779 unsigned long flags;
5781 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
5782 spin_lock_irqsave(&host->lock, flags);
5784 for (i = 0; i < host->n_ports; i++) {
5785 struct ata_port *ap;
5787 ap = host->ports[i];
5789 !(ap->flags & ATA_FLAG_DISABLED)) {
5790 struct ata_queued_cmd *qc;
5792 qc = ata_qc_from_tag(ap, ap->link.active_tag);
5793 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5794 (qc->flags & ATA_QCFLAG_ACTIVE))
5795 handled |= ata_host_intr(ap, qc);
5799 spin_unlock_irqrestore(&host->lock, flags);
5801 return IRQ_RETVAL(handled);
5805 * sata_scr_valid - test whether SCRs are accessible
5806 * @link: ATA link to test SCR accessibility for
5808 * Test whether SCRs are accessible for @link.
5814 * 1 if SCRs are accessible, 0 otherwise.
5816 int sata_scr_valid(struct ata_link *link)
5818 struct ata_port *ap = link->ap;
5820 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5824 * sata_scr_read - read SCR register of the specified port
5825 * @link: ATA link to read SCR for
5827 * @val: Place to store read value
5829 * Read SCR register @reg of @link into *@val. This function is
5830 * guaranteed to succeed if the cable type of the port is SATA
5831 * and the port implements ->scr_read.
5837 * 0 on success, negative errno on failure.
5839 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5841 struct ata_port *ap = link->ap;
5843 if (sata_scr_valid(link))
5844 return ap->ops->scr_read(ap, reg, val);
5849 * sata_scr_write - write SCR register of the specified port
5850 * @link: ATA link to write SCR for
5851 * @reg: SCR to write
5852 * @val: value to write
5854 * Write @val to SCR register @reg of @link. This function is
5855 * guaranteed to succeed if the cable type of the port is SATA
5856 * and the port implements ->scr_read.
5862 * 0 on success, negative errno on failure.
5864 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5866 struct ata_port *ap = link->ap;
5868 if (sata_scr_valid(link))
5869 return ap->ops->scr_write(ap, reg, val);
5874 * sata_scr_write_flush - write SCR register of the specified port and flush
5875 * @link: ATA link to write SCR for
5876 * @reg: SCR to write
5877 * @val: value to write
5879 * This function is identical to sata_scr_write() except that this
5880 * function performs flush after writing to the register.
5886 * 0 on success, negative errno on failure.
5888 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5890 struct ata_port *ap = link->ap;
5893 if (sata_scr_valid(link)) {
5894 rc = ap->ops->scr_write(ap, reg, val);
5896 rc = ap->ops->scr_read(ap, reg, &val);
5903 * ata_link_online - test whether the given link is online
5904 * @link: ATA link to test
5906 * Test whether @link is online. Note that this function returns
5907 * 0 if online status of @link cannot be obtained, so
5908 * ata_link_online(link) != !ata_link_offline(link).
5914 * 1 if the port online status is available and online.
5916 int ata_link_online(struct ata_link *link)
5920 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5921 (sstatus & 0xf) == 0x3)
5927 * ata_link_offline - test whether the given link is offline
5928 * @link: ATA link to test
5930 * Test whether @link is offline. Note that this function
5931 * returns 0 if offline status of @link cannot be obtained, so
5932 * ata_link_online(link) != !ata_link_offline(link).
5938 * 1 if the port offline status is available and offline.
5940 int ata_link_offline(struct ata_link *link)
5944 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5945 (sstatus & 0xf) != 0x3)
5950 int ata_flush_cache(struct ata_device *dev)
5952 unsigned int err_mask;
5955 if (!ata_try_flush_cache(dev))
5958 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
5959 cmd = ATA_CMD_FLUSH_EXT;
5961 cmd = ATA_CMD_FLUSH;
5963 /* This is wrong. On a failed flush we get back the LBA of the lost
5964 sector and we should (assuming it wasn't aborted as unknown) issue
5965 a further flush command to continue the writeback until it
5967 err_mask = ata_do_simple_cmd(dev, cmd);
5969 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
5977 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5978 unsigned int action, unsigned int ehi_flags,
5981 unsigned long flags;
5984 for (i = 0; i < host->n_ports; i++) {
5985 struct ata_port *ap = host->ports[i];
5986 struct ata_link *link;
5988 /* Previous resume operation might still be in
5989 * progress. Wait for PM_PENDING to clear.
5991 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5992 ata_port_wait_eh(ap);
5993 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5996 /* request PM ops to EH */
5997 spin_lock_irqsave(ap->lock, flags);
6002 ap->pm_result = &rc;
6005 ap->pflags |= ATA_PFLAG_PM_PENDING;
6006 __ata_port_for_each_link(link, ap) {
6007 link->eh_info.action |= action;
6008 link->eh_info.flags |= ehi_flags;
6011 ata_port_schedule_eh(ap);
6013 spin_unlock_irqrestore(ap->lock, flags);
6015 /* wait and check result */
6017 ata_port_wait_eh(ap);
6018 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6028 * ata_host_suspend - suspend host
6029 * @host: host to suspend
6032 * Suspend @host. Actual operation is performed by EH. This
6033 * function requests EH to perform PM operations and waits for EH
6037 * Kernel thread context (may sleep).
6040 * 0 on success, -errno on failure.
6042 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6046 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6048 host->dev->power.power_state = mesg;
6053 * ata_host_resume - resume host
6054 * @host: host to resume
6056 * Resume @host. Actual operation is performed by EH. This
6057 * function requests EH to perform PM operations and returns.
6058 * Note that all resume operations are performed parallely.
6061 * Kernel thread context (may sleep).
6063 void ata_host_resume(struct ata_host *host)
6065 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
6066 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
6067 host->dev->power.power_state = PMSG_ON;
6072 * ata_port_start - Set port up for dma.
6073 * @ap: Port to initialize
6075 * Called just after data structures for each port are
6076 * initialized. Allocates space for PRD table.
6078 * May be used as the port_start() entry in ata_port_operations.
6081 * Inherited from caller.
6083 int ata_port_start(struct ata_port *ap)
6085 struct device *dev = ap->dev;
6088 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
6093 rc = ata_pad_alloc(ap, dev);
6097 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
6098 (unsigned long long)ap->prd_dma);
6103 * ata_dev_init - Initialize an ata_device structure
6104 * @dev: Device structure to initialize
6106 * Initialize @dev in preparation for probing.
6109 * Inherited from caller.
6111 void ata_dev_init(struct ata_device *dev)
6113 struct ata_link *link = dev->link;
6114 struct ata_port *ap = link->ap;
6115 unsigned long flags;
6117 /* SATA spd limit is bound to the first device */
6118 link->sata_spd_limit = link->hw_sata_spd_limit;
6121 /* High bits of dev->flags are used to record warm plug
6122 * requests which occur asynchronously. Synchronize using
6125 spin_lock_irqsave(ap->lock, flags);
6126 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6128 spin_unlock_irqrestore(ap->lock, flags);
6130 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6131 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6132 dev->pio_mask = UINT_MAX;
6133 dev->mwdma_mask = UINT_MAX;
6134 dev->udma_mask = UINT_MAX;
6138 * ata_link_init - Initialize an ata_link structure
6139 * @ap: ATA port link is attached to
6140 * @link: Link structure to initialize
6141 * @pmp: Port multiplier port number
6146 * Kernel thread context (may sleep)
6148 static void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6152 /* clear everything except for devices */
6153 memset(link, 0, offsetof(struct ata_link, device[0]));
6157 link->active_tag = ATA_TAG_POISON;
6158 link->hw_sata_spd_limit = UINT_MAX;
6160 /* can't use iterator, ap isn't initialized yet */
6161 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6162 struct ata_device *dev = &link->device[i];
6165 dev->devno = dev - link->device;
6171 * sata_link_init_spd - Initialize link->sata_spd_limit
6172 * @link: Link to configure sata_spd_limit for
6174 * Initialize @link->[hw_]sata_spd_limit to the currently
6178 * Kernel thread context (may sleep).
6181 * 0 on success, -errno on failure.
6183 static int sata_link_init_spd(struct ata_link *link)
6188 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
6192 spd = (scontrol >> 4) & 0xf;
6194 link->hw_sata_spd_limit &= (1 << spd) - 1;
6196 link->sata_spd_limit = link->hw_sata_spd_limit;
6202 * ata_port_alloc - allocate and initialize basic ATA port resources
6203 * @host: ATA host this allocated port belongs to
6205 * Allocate and initialize basic ATA port resources.
6208 * Allocate ATA port on success, NULL on failure.
6211 * Inherited from calling layer (may sleep).
6213 struct ata_port *ata_port_alloc(struct ata_host *host)
6215 struct ata_port *ap;
6219 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6223 ap->pflags |= ATA_PFLAG_INITIALIZING;
6224 ap->lock = &host->lock;
6225 ap->flags = ATA_FLAG_DISABLED;
6227 ap->ctl = ATA_DEVCTL_OBS;
6229 ap->dev = host->dev;
6230 ap->last_ctl = 0xFF;
6232 #if defined(ATA_VERBOSE_DEBUG)
6233 /* turn on all debugging levels */
6234 ap->msg_enable = 0x00FF;
6235 #elif defined(ATA_DEBUG)
6236 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6238 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6241 INIT_DELAYED_WORK(&ap->port_task, NULL);
6242 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6243 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6244 INIT_LIST_HEAD(&ap->eh_done_q);
6245 init_waitqueue_head(&ap->eh_wait_q);
6246 init_timer_deferrable(&ap->fastdrain_timer);
6247 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
6248 ap->fastdrain_timer.data = (unsigned long)ap;
6250 ap->cbl = ATA_CBL_NONE;
6252 ata_link_init(ap, &ap->link, 0);
6255 ap->stats.unhandled_irq = 1;
6256 ap->stats.idle_irq = 1;
6261 static void ata_host_release(struct device *gendev, void *res)
6263 struct ata_host *host = dev_get_drvdata(gendev);
6266 for (i = 0; i < host->n_ports; i++) {
6267 struct ata_port *ap = host->ports[i];
6272 if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6273 ap->ops->port_stop(ap);
6276 if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6277 host->ops->host_stop(host);
6279 for (i = 0; i < host->n_ports; i++) {
6280 struct ata_port *ap = host->ports[i];
6286 scsi_host_put(ap->scsi_host);
6289 host->ports[i] = NULL;
6292 dev_set_drvdata(gendev, NULL);
6296 * ata_host_alloc - allocate and init basic ATA host resources
6297 * @dev: generic device this host is associated with
6298 * @max_ports: maximum number of ATA ports associated with this host
6300 * Allocate and initialize basic ATA host resources. LLD calls
6301 * this function to allocate a host, initializes it fully and
6302 * attaches it using ata_host_register().
6304 * @max_ports ports are allocated and host->n_ports is
6305 * initialized to @max_ports. The caller is allowed to decrease
6306 * host->n_ports before calling ata_host_register(). The unused
6307 * ports will be automatically freed on registration.
6310 * Allocate ATA host on success, NULL on failure.
6313 * Inherited from calling layer (may sleep).
6315 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6317 struct ata_host *host;
6323 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6326 /* alloc a container for our list of ATA ports (buses) */
6327 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6328 /* alloc a container for our list of ATA ports (buses) */
6329 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6333 devres_add(dev, host);
6334 dev_set_drvdata(dev, host);
6336 spin_lock_init(&host->lock);
6338 host->n_ports = max_ports;
6340 /* allocate ports bound to this host */
6341 for (i = 0; i < max_ports; i++) {
6342 struct ata_port *ap;
6344 ap = ata_port_alloc(host);
6349 host->ports[i] = ap;
6352 devres_remove_group(dev, NULL);
6356 devres_release_group(dev, NULL);
6361 * ata_host_alloc_pinfo - alloc host and init with port_info array
6362 * @dev: generic device this host is associated with
6363 * @ppi: array of ATA port_info to initialize host with
6364 * @n_ports: number of ATA ports attached to this host
6366 * Allocate ATA host and initialize with info from @ppi. If NULL
6367 * terminated, @ppi may contain fewer entries than @n_ports. The
6368 * last entry will be used for the remaining ports.
6371 * Allocate ATA host on success, NULL on failure.
6374 * Inherited from calling layer (may sleep).
6376 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6377 const struct ata_port_info * const * ppi,
6380 const struct ata_port_info *pi;
6381 struct ata_host *host;
6384 host = ata_host_alloc(dev, n_ports);
6388 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6389 struct ata_port *ap = host->ports[i];
6394 ap->pio_mask = pi->pio_mask;
6395 ap->mwdma_mask = pi->mwdma_mask;
6396 ap->udma_mask = pi->udma_mask;
6397 ap->flags |= pi->flags;
6398 ap->link.flags |= pi->link_flags;
6399 ap->ops = pi->port_ops;
6401 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6402 host->ops = pi->port_ops;
6403 if (!host->private_data && pi->private_data)
6404 host->private_data = pi->private_data;
6411 * ata_host_start - start and freeze ports of an ATA host
6412 * @host: ATA host to start ports for
6414 * Start and then freeze ports of @host. Started status is
6415 * recorded in host->flags, so this function can be called
6416 * multiple times. Ports are guaranteed to get started only
6417 * once. If host->ops isn't initialized yet, its set to the
6418 * first non-dummy port ops.
6421 * Inherited from calling layer (may sleep).
6424 * 0 if all ports are started successfully, -errno otherwise.
6426 int ata_host_start(struct ata_host *host)
6430 if (host->flags & ATA_HOST_STARTED)
6433 for (i = 0; i < host->n_ports; i++) {
6434 struct ata_port *ap = host->ports[i];
6436 if (!host->ops && !ata_port_is_dummy(ap))
6437 host->ops = ap->ops;
6439 if (ap->ops->port_start) {
6440 rc = ap->ops->port_start(ap);
6442 ata_port_printk(ap, KERN_ERR, "failed to "
6443 "start port (errno=%d)\n", rc);
6448 ata_eh_freeze_port(ap);
6451 host->flags |= ATA_HOST_STARTED;
6456 struct ata_port *ap = host->ports[i];
6458 if (ap->ops->port_stop)
6459 ap->ops->port_stop(ap);
6465 * ata_sas_host_init - Initialize a host struct
6466 * @host: host to initialize
6467 * @dev: device host is attached to
6468 * @flags: host flags
6472 * PCI/etc. bus probe sem.
6475 /* KILLME - the only user left is ipr */
6476 void ata_host_init(struct ata_host *host, struct device *dev,
6477 unsigned long flags, const struct ata_port_operations *ops)
6479 spin_lock_init(&host->lock);
6481 host->flags = flags;
6486 * ata_host_register - register initialized ATA host
6487 * @host: ATA host to register
6488 * @sht: template for SCSI host
6490 * Register initialized ATA host. @host is allocated using
6491 * ata_host_alloc() and fully initialized by LLD. This function
6492 * starts ports, registers @host with ATA and SCSI layers and
6493 * probe registered devices.
6496 * Inherited from calling layer (may sleep).
6499 * 0 on success, -errno otherwise.
6501 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6505 /* host must have been started */
6506 if (!(host->flags & ATA_HOST_STARTED)) {
6507 dev_printk(KERN_ERR, host->dev,
6508 "BUG: trying to register unstarted host\n");
6513 /* Blow away unused ports. This happens when LLD can't
6514 * determine the exact number of ports to allocate at
6517 for (i = host->n_ports; host->ports[i]; i++)
6518 kfree(host->ports[i]);
6520 /* give ports names and add SCSI hosts */
6521 for (i = 0; i < host->n_ports; i++)
6522 host->ports[i]->print_id = ata_print_id++;
6524 rc = ata_scsi_add_hosts(host, sht);
6528 /* associate with ACPI nodes */
6529 ata_acpi_associate(host);
6531 /* set cable, sata_spd_limit and report */
6532 for (i = 0; i < host->n_ports; i++) {
6533 struct ata_port *ap = host->ports[i];
6535 unsigned long xfer_mask;
6537 /* set SATA cable type if still unset */
6538 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6539 ap->cbl = ATA_CBL_SATA;
6541 /* init sata_spd_limit to the current value */
6542 sata_link_init_spd(&ap->link);
6544 /* report the secondary IRQ for second channel legacy */
6545 irq_line = host->irq;
6546 if (i == 1 && host->irq2)
6547 irq_line = host->irq2;
6549 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6552 /* print per-port info to dmesg */
6553 if (!ata_port_is_dummy(ap))
6554 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
6555 "ctl 0x%p bmdma 0x%p irq %d\n",
6556 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6557 ata_mode_string(xfer_mask),
6558 ap->ioaddr.cmd_addr,
6559 ap->ioaddr.ctl_addr,
6560 ap->ioaddr.bmdma_addr,
6563 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
6566 /* perform each probe synchronously */
6567 DPRINTK("probe begin\n");
6568 for (i = 0; i < host->n_ports; i++) {
6569 struct ata_port *ap = host->ports[i];
6573 if (ap->ops->error_handler) {
6574 struct ata_eh_info *ehi = &ap->link.eh_info;
6575 unsigned long flags;
6579 /* kick EH for boot probing */
6580 spin_lock_irqsave(ap->lock, flags);
6583 (1 << ata_link_max_devices(&ap->link)) - 1;
6584 ehi->action |= ATA_EH_SOFTRESET;
6585 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6587 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6588 ap->pflags |= ATA_PFLAG_LOADING;
6589 ata_port_schedule_eh(ap);
6591 spin_unlock_irqrestore(ap->lock, flags);
6593 /* wait for EH to finish */
6594 ata_port_wait_eh(ap);
6596 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6597 rc = ata_bus_probe(ap);
6598 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6601 /* FIXME: do something useful here?
6602 * Current libata behavior will
6603 * tear down everything when
6604 * the module is removed
6605 * or the h/w is unplugged.
6611 /* probes are done, now scan each port's disk(s) */
6612 DPRINTK("host probe begin\n");
6613 for (i = 0; i < host->n_ports; i++) {
6614 struct ata_port *ap = host->ports[i];
6616 ata_scsi_scan_host(ap, 1);
6623 * ata_host_activate - start host, request IRQ and register it
6624 * @host: target ATA host
6625 * @irq: IRQ to request
6626 * @irq_handler: irq_handler used when requesting IRQ
6627 * @irq_flags: irq_flags used when requesting IRQ
6628 * @sht: scsi_host_template to use when registering the host
6630 * After allocating an ATA host and initializing it, most libata
6631 * LLDs perform three steps to activate the host - start host,
6632 * request IRQ and register it. This helper takes necessasry
6633 * arguments and performs the three steps in one go.
6636 * Inherited from calling layer (may sleep).
6639 * 0 on success, -errno otherwise.
6641 int ata_host_activate(struct ata_host *host, int irq,
6642 irq_handler_t irq_handler, unsigned long irq_flags,
6643 struct scsi_host_template *sht)
6647 rc = ata_host_start(host);
6651 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6652 dev_driver_string(host->dev), host);
6656 /* Used to print device info at probe */
6659 rc = ata_host_register(host, sht);
6660 /* if failed, just free the IRQ and leave ports alone */
6662 devm_free_irq(host->dev, irq, host);
6668 * ata_port_detach - Detach ATA port in prepration of device removal
6669 * @ap: ATA port to be detached
6671 * Detach all ATA devices and the associated SCSI devices of @ap;
6672 * then, remove the associated SCSI host. @ap is guaranteed to
6673 * be quiescent on return from this function.
6676 * Kernel thread context (may sleep).
6678 void ata_port_detach(struct ata_port *ap)
6680 unsigned long flags;
6681 struct ata_link *link;
6682 struct ata_device *dev;
6684 if (!ap->ops->error_handler)
6687 /* tell EH we're leaving & flush EH */
6688 spin_lock_irqsave(ap->lock, flags);
6689 ap->pflags |= ATA_PFLAG_UNLOADING;
6690 spin_unlock_irqrestore(ap->lock, flags);
6692 ata_port_wait_eh(ap);
6694 /* EH is now guaranteed to see UNLOADING, so no new device
6695 * will be attached. Disable all existing devices.
6697 spin_lock_irqsave(ap->lock, flags);
6699 ata_port_for_each_link(link, ap) {
6700 ata_link_for_each_dev(dev, link)
6701 ata_dev_disable(dev);
6704 spin_unlock_irqrestore(ap->lock, flags);
6706 /* Final freeze & EH. All in-flight commands are aborted. EH
6707 * will be skipped and retrials will be terminated with bad
6710 spin_lock_irqsave(ap->lock, flags);
6711 ata_port_freeze(ap); /* won't be thawed */
6712 spin_unlock_irqrestore(ap->lock, flags);
6714 ata_port_wait_eh(ap);
6715 cancel_rearming_delayed_work(&ap->hotplug_task);
6718 /* remove the associated SCSI host */
6719 scsi_remove_host(ap->scsi_host);
6723 * ata_host_detach - Detach all ports of an ATA host
6724 * @host: Host to detach
6726 * Detach all ports of @host.
6729 * Kernel thread context (may sleep).
6731 void ata_host_detach(struct ata_host *host)
6735 for (i = 0; i < host->n_ports; i++)
6736 ata_port_detach(host->ports[i]);
6740 * ata_std_ports - initialize ioaddr with standard port offsets.
6741 * @ioaddr: IO address structure to be initialized
6743 * Utility function which initializes data_addr, error_addr,
6744 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
6745 * device_addr, status_addr, and command_addr to standard offsets
6746 * relative to cmd_addr.
6748 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
6751 void ata_std_ports(struct ata_ioports *ioaddr)
6753 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
6754 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
6755 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
6756 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
6757 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
6758 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
6759 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
6760 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
6761 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
6762 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
6769 * ata_pci_remove_one - PCI layer callback for device removal
6770 * @pdev: PCI device that was removed
6772 * PCI layer indicates to libata via this hook that hot-unplug or
6773 * module unload event has occurred. Detach all ports. Resource
6774 * release is handled via devres.
6777 * Inherited from PCI layer (may sleep).
6779 void ata_pci_remove_one(struct pci_dev *pdev)
6781 struct device *dev = pci_dev_to_dev(pdev);
6782 struct ata_host *host = dev_get_drvdata(dev);
6784 ata_host_detach(host);
6787 /* move to PCI subsystem */
6788 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6790 unsigned long tmp = 0;
6792 switch (bits->width) {
6795 pci_read_config_byte(pdev, bits->reg, &tmp8);
6801 pci_read_config_word(pdev, bits->reg, &tmp16);
6807 pci_read_config_dword(pdev, bits->reg, &tmp32);
6818 return (tmp == bits->val) ? 1 : 0;
6822 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6824 pci_save_state(pdev);
6825 pci_disable_device(pdev);
6827 if (mesg.event == PM_EVENT_SUSPEND)
6828 pci_set_power_state(pdev, PCI_D3hot);
6831 int ata_pci_device_do_resume(struct pci_dev *pdev)
6835 pci_set_power_state(pdev, PCI_D0);
6836 pci_restore_state(pdev);
6838 rc = pcim_enable_device(pdev);
6840 dev_printk(KERN_ERR, &pdev->dev,
6841 "failed to enable device after resume (%d)\n", rc);
6845 pci_set_master(pdev);
6849 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6851 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6854 rc = ata_host_suspend(host, mesg);
6858 ata_pci_device_do_suspend(pdev, mesg);
6863 int ata_pci_device_resume(struct pci_dev *pdev)
6865 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6868 rc = ata_pci_device_do_resume(pdev);
6870 ata_host_resume(host);
6873 #endif /* CONFIG_PM */
6875 #endif /* CONFIG_PCI */
6878 static int __init ata_init(void)
6880 ata_probe_timeout *= HZ;
6881 ata_wq = create_workqueue("ata");
6885 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6887 destroy_workqueue(ata_wq);
6891 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6895 static void __exit ata_exit(void)
6897 destroy_workqueue(ata_wq);
6898 destroy_workqueue(ata_aux_wq);
6901 subsys_initcall(ata_init);
6902 module_exit(ata_exit);
6904 static unsigned long ratelimit_time;
6905 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6907 int ata_ratelimit(void)
6910 unsigned long flags;
6912 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6914 if (time_after(jiffies, ratelimit_time)) {
6916 ratelimit_time = jiffies + (HZ/5);
6920 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6926 * ata_wait_register - wait until register value changes
6927 * @reg: IO-mapped register
6928 * @mask: Mask to apply to read register value
6929 * @val: Wait condition
6930 * @interval_msec: polling interval in milliseconds
6931 * @timeout_msec: timeout in milliseconds
6933 * Waiting for some bits of register to change is a common
6934 * operation for ATA controllers. This function reads 32bit LE
6935 * IO-mapped register @reg and tests for the following condition.
6937 * (*@reg & mask) != val
6939 * If the condition is met, it returns; otherwise, the process is
6940 * repeated after @interval_msec until timeout.
6943 * Kernel thread context (may sleep)
6946 * The final register value.
6948 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6949 unsigned long interval_msec,
6950 unsigned long timeout_msec)
6952 unsigned long timeout;
6955 tmp = ioread32(reg);
6957 /* Calculate timeout _after_ the first read to make sure
6958 * preceding writes reach the controller before starting to
6959 * eat away the timeout.
6961 timeout = jiffies + (timeout_msec * HZ) / 1000;
6963 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6964 msleep(interval_msec);
6965 tmp = ioread32(reg);
6974 static void ata_dummy_noret(struct ata_port *ap) { }
6975 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6976 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6978 static u8 ata_dummy_check_status(struct ata_port *ap)
6983 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6985 return AC_ERR_SYSTEM;
6988 const struct ata_port_operations ata_dummy_port_ops = {
6989 .port_disable = ata_port_disable,
6990 .check_status = ata_dummy_check_status,
6991 .check_altstatus = ata_dummy_check_status,
6992 .dev_select = ata_noop_dev_select,
6993 .qc_prep = ata_noop_qc_prep,
6994 .qc_issue = ata_dummy_qc_issue,
6995 .freeze = ata_dummy_noret,
6996 .thaw = ata_dummy_noret,
6997 .error_handler = ata_dummy_noret,
6998 .post_internal_cmd = ata_dummy_qc_noret,
6999 .irq_clear = ata_dummy_noret,
7000 .port_start = ata_dummy_ret0,
7001 .port_stop = ata_dummy_noret,
7004 const struct ata_port_info ata_dummy_port_info = {
7005 .port_ops = &ata_dummy_port_ops,
7009 * libata is essentially a library of internal helper functions for
7010 * low-level ATA host controller drivers. As such, the API/ABI is
7011 * likely to change as new drivers are added and updated.
7012 * Do not depend on ABI/API stability.
7015 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7016 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7017 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7018 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7019 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7020 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7021 EXPORT_SYMBOL_GPL(ata_std_ports);
7022 EXPORT_SYMBOL_GPL(ata_host_init);
7023 EXPORT_SYMBOL_GPL(ata_host_alloc);
7024 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7025 EXPORT_SYMBOL_GPL(ata_host_start);
7026 EXPORT_SYMBOL_GPL(ata_host_register);
7027 EXPORT_SYMBOL_GPL(ata_host_activate);
7028 EXPORT_SYMBOL_GPL(ata_host_detach);
7029 EXPORT_SYMBOL_GPL(ata_sg_init);
7030 EXPORT_SYMBOL_GPL(ata_sg_init_one);
7031 EXPORT_SYMBOL_GPL(ata_hsm_move);
7032 EXPORT_SYMBOL_GPL(ata_qc_complete);
7033 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7034 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
7035 EXPORT_SYMBOL_GPL(ata_tf_load);
7036 EXPORT_SYMBOL_GPL(ata_tf_read);
7037 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
7038 EXPORT_SYMBOL_GPL(ata_std_dev_select);
7039 EXPORT_SYMBOL_GPL(sata_print_link_status);
7040 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7041 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7042 EXPORT_SYMBOL_GPL(ata_check_status);
7043 EXPORT_SYMBOL_GPL(ata_altstatus);
7044 EXPORT_SYMBOL_GPL(ata_exec_command);
7045 EXPORT_SYMBOL_GPL(ata_port_start);
7046 EXPORT_SYMBOL_GPL(ata_sff_port_start);
7047 EXPORT_SYMBOL_GPL(ata_interrupt);
7048 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7049 EXPORT_SYMBOL_GPL(ata_data_xfer);
7050 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7051 EXPORT_SYMBOL_GPL(ata_qc_prep);
7052 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7053 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7054 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
7055 EXPORT_SYMBOL_GPL(ata_bmdma_start);
7056 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
7057 EXPORT_SYMBOL_GPL(ata_bmdma_status);
7058 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7059 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
7060 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
7061 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
7062 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
7063 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
7064 EXPORT_SYMBOL_GPL(ata_port_probe);
7065 EXPORT_SYMBOL_GPL(ata_dev_disable);
7066 EXPORT_SYMBOL_GPL(sata_set_spd);
7067 EXPORT_SYMBOL_GPL(sata_link_debounce);
7068 EXPORT_SYMBOL_GPL(sata_link_resume);
7069 EXPORT_SYMBOL_GPL(sata_phy_reset);
7070 EXPORT_SYMBOL_GPL(__sata_phy_reset);
7071 EXPORT_SYMBOL_GPL(ata_bus_reset);
7072 EXPORT_SYMBOL_GPL(ata_std_prereset);
7073 EXPORT_SYMBOL_GPL(ata_std_softreset);
7074 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7075 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7076 EXPORT_SYMBOL_GPL(ata_std_postreset);
7077 EXPORT_SYMBOL_GPL(ata_dev_classify);
7078 EXPORT_SYMBOL_GPL(ata_dev_pair);
7079 EXPORT_SYMBOL_GPL(ata_port_disable);
7080 EXPORT_SYMBOL_GPL(ata_ratelimit);
7081 EXPORT_SYMBOL_GPL(ata_wait_register);
7082 EXPORT_SYMBOL_GPL(ata_busy_sleep);
7083 EXPORT_SYMBOL_GPL(ata_wait_ready);
7084 EXPORT_SYMBOL_GPL(ata_port_queue_task);
7085 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
7086 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7087 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7088 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7089 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7090 EXPORT_SYMBOL_GPL(ata_host_intr);
7091 EXPORT_SYMBOL_GPL(sata_scr_valid);
7092 EXPORT_SYMBOL_GPL(sata_scr_read);
7093 EXPORT_SYMBOL_GPL(sata_scr_write);
7094 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7095 EXPORT_SYMBOL_GPL(ata_link_online);
7096 EXPORT_SYMBOL_GPL(ata_link_offline);
7098 EXPORT_SYMBOL_GPL(ata_host_suspend);
7099 EXPORT_SYMBOL_GPL(ata_host_resume);
7100 #endif /* CONFIG_PM */
7101 EXPORT_SYMBOL_GPL(ata_id_string);
7102 EXPORT_SYMBOL_GPL(ata_id_c_string);
7103 EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
7104 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7106 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7107 EXPORT_SYMBOL_GPL(ata_timing_compute);
7108 EXPORT_SYMBOL_GPL(ata_timing_merge);
7111 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7112 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
7113 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7114 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7115 EXPORT_SYMBOL_GPL(ata_pci_init_one);
7116 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7118 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7119 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7120 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7121 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7122 #endif /* CONFIG_PM */
7123 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
7124 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
7125 #endif /* CONFIG_PCI */
7127 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7128 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7129 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7130 EXPORT_SYMBOL_GPL(ata_eng_timeout);
7131 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7132 EXPORT_SYMBOL_GPL(ata_link_abort);
7133 EXPORT_SYMBOL_GPL(ata_port_abort);
7134 EXPORT_SYMBOL_GPL(ata_port_freeze);
7135 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7136 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7137 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7138 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7139 EXPORT_SYMBOL_GPL(ata_do_eh);
7140 EXPORT_SYMBOL_GPL(ata_irq_on);
7141 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
7143 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7144 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7145 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7146 EXPORT_SYMBOL_GPL(ata_cable_sata);